***UPDATED 06-10-2013*** I have managed to fix the 2.1GHz CPU limit of Windows 95. Completely with updates from Microsoft... when they claimed there was no fix for this. Here's a link to the MSKB article on this issue. Q312108 - Windows Protection Error in NDIS With a CPU That Is Faster Than 2.1 GHz -------------------------------------------------------------------------------------- Version 3.0 Released 06-10-2013 New or otherwise significant in this version: - Version 3.0 can be used on all Windows 95 versions. (RTM\OSR2) (95\95A\95B\95C) - Version 3.0 addresses specific issues with and better supports Windows 95 RTM. (95\95A) - Version 3.0 makes the proper registry entries that would be made if AMDK6UPD.EXE and the other updates were installed under Windows 95. - Version 3.0 includes a Processor-specific HotFix for Windows 95B OSR2. It is not needed on other versions of 95. - Version 3.0 no longer includes or mandates the installation of DUN14-95.EXE. Still "recommended." - Version 3.0 can be installed before or after the "Windows Protection Error in IOS" has been displayed. (Before is still the preferred method.) - Version 3.0 can patch a Windows 95 installation in directories other than C:\WINDOWS. - Version 3.0 includes further updated versions of some system files contained in the AMDK6UPD.EXE patch, rendering AMDK6UPD.EXE obsolete. - Version 3.0 includes PTCHCDFS, a free update by Rudolph Loew that corrects the displayed size of DVD media. -------------------------------------------------------------------------------------- The README.TXT from FIX95CPU_V3_FINAL.ZIP, provides a detailed overview of this project, this issues it addresses, and the instructions for getting it to work. I will post it here: ------------------------------------------------------------------------------------------ Windows 95 High-Speed Processor Support v. 3.0 By LoneCrusader CONTENTS OF THIS PACKAGE: README.TXT - Self Explanatory. FIX95CPU.EXE - Self-Extracting Bootable Floppy Disk image. FIX95CPU.IMA - A standard image of the Bootable Floppy. (For Virtual Machines.) FIX95CPU.ISO - A standard Bootable CD image. (For Virtual Machines, or systems without a floppy drive.) VMM2XUPD.EXE - HotFix with updated VMM.VXD's for Windows 95 B OSR2. (Install in Windows 95 B OSR2 after Setup has completed.) ----------------------------------- NOTE: The first section of this README will explain the issues addressed by this patch. If you are familiar with these issues, you may skip to the second section for step-by-step instructions. SECTION ONE: Windows 95 has two specific errors when dealing with processors with speeds higher than 350 MHz. With a little patience however, both of these errors are fixable. The first error occurs with processors greater than 350 MHz. Microsoft released a patch for this error, AMDK6UPD.EXE. This patch IS NOT just for AMD processors. It will work for Intel Pentium 4 processors as well. The problem with Microsoft's patch is that it must be run from within Windows. When your system encounters this error, you will not be able to boot into Windows. This error will be displayed on the first reboot during the installation process. Here is the text of the error: While initializing device IOS: Windows Protection Error. You need to restart your computer. The only way to fix this error is to manually install the files contained in the Microsoft AMDK6UPD.EXE patch. This package automates the process for you, so I will not go into further detail on that issue here. The second error occurs with processors greater than 2.1 GHz. This problem also affected Windows 98 (First Edition), and Microsoft issued a HotFix for Windows 98, but not for Windows 95. According to Microsoft, there is no fix for this problem in Windows 95... WRONG! This error is very similar to the previous one, and it will also be displayed on the first reboot of the install process, after you have fixed the previous error. Here is the text of the error: While initializing device NDIS: Windows Protection Error. You need to restart your computer. This error is corrected by an updated file contained in the DUN14-95.EXE Dial-Up Networking 1.4 Update for Windows 95. This package automates the process for you, so I will not go into further detail on that issue here. NOTE: This update renders the AMDK6UPD.EXE patch OBSOLETE, as it installs newer versions of some system files contained within AMDK6UPD.EXE. While the main purpose of this update is to enable the use of High-Speed Processors, I decided to include any available newer versions of the system files already contained in this patch. List of Issues (MSKB Articles) FIXED by this update: Q192841 - Difficulties Using AMD K6-2 or Athlon Central Processing Unit Q234259 - Revision to AMD K6-2/350 Central Processing Unit Update Q312108 - Windows Protection Error in NDIS with CPU Faster Than 2.1 GHz Q231942 - Cannot Undock Notebook Computer with LS-120 Removable Drive Q175629 - Large IDE Hard Disk May Run In Compatibility Mode Q274175 - Error Opening/Copying File/Folder Eight Levels Deep on CD-ROM Q159153 - Error Messages While Backing Up to Some Floppy Disk Drives This update also includes a patched version of CDFS.VXD using PTCHCDFS, a free update by Rudolph Loew (rloew) to fix the incorrect size value (1.99GB) reported by Windows 9X for DVD's. A separate bug exists in Windows 95 RTM/A that causes DVD sizes over 4GB to not have their byte counts displayed properly, showing "---" instead, but the correct total size of the DVD will still be displayed. Installing other update packages for Windows 95 RTM/A may yield a solution to this, but has not been tested. Also included in this version is a HotFix, VMM2XUPD.EXE, which installs the latest version of VMM.VXD for Windows 95 B OSR2. This package should be installed when Windows 95 B OSR2 Setup has completed. This update will not run on Windows 95 RTM/A and is not required on Windows 95 C OSR2.5. Credits & Other Information: Rudolph Loew has also created a free UDF filesystem driver for reading UDF formatted CD's/DVD's in Windows 95. It can be obtained from his site at: http://rloew1.no-ip.com or mirror at: http://rloew.limewebs.com Many thanks go out to Rudolph Loew for his assistance with this project! Credit also goes to Petr at MSFN for providing patched files for 95 RTM. And finally credit to Queue at MSFN for creating the ANSI Windows Logo. For further information and updates, visit this topic at MSFN Forums: http://www.msfn.org/board/index.php?showtopic=141402 This package makes use of the General Replace (GR) text replace utility created by Andrew Sharrad, which can be found at: http://www.sharradsoftware.co.uk SECTION TWO: Follow these Instructions to get Windows 95 up and running. You Will Need: Blank Floppy Disk or Blank CD Files Contained In FIX95CPU.ZIP NOTE: If your system does not have a floppy drive, the FIX95CPU.ISO Bootable CD image in this package can be used (with Nero or a similar CD burning program) to create a bootable CD that can be used instead of a floppy. NOTE: These instructions and the FIX95CPU installer assume that you are installing Windows 95 to C:\ Drive, however you can use a directory other than C:\WINDOWS. 1. On another computer, use the self-extracting Floppy Disk image (FIX95CPU.EXE) or the Bootable CD image (FIX95CPU.ISO) provided in FIX95CPU.ZIP to create a custom Boot Disk that will contain this patch. 2. Prepare your system and run Windows 95 Setup. 3. When Windows 95 asks you to Restart, insert the Boot Disk or Boot CD that you created with the enclosed image, and click Finish. You should have the Boot Disk or Boot CD inserted BEFORE Windows Setup continues and the IOS error is displayed in order to speed up the boot process by combining .VXD's with WININIT.EXE, but this version allows for installation after the IOS error has been displayed. 4. The Boot Disk will start your computer in DOS mode. Press SPACE and you will be given an opportunity to view this README file. Choose Y or N, and then all you need to do is press SPACE again to bring up the next page of the README, or to apply the patch. The program will output its actions to the screen so you can see what is being done. Pressing CTRL-C at any time will terminate the FIX95CPU program. 5. When finished, press SPACE to reboot your system, then remove the Boot Disk or Boot CD so Windows 95 Setup can continue normally. If you are installing Windows 95 RTM/A or C OSR2.5, you are finished. For Windows 95 B OSR2 ONLY: 6. When Setup is complete and your Windows Desktop loads, run VMM2XUPD.EXE to update VMM.VXD to the latest version, and you will be prompted to restart. This update is not necessary on Windows 95 C OSR2.5. If you have Windows 95 RTM/A or C OSR2.5, skip this step. The VMM2XUPD.EXE will not install on Windows 95 RTM/A. The VMM2XUPD.EXE update addresses the following issue: Q179897 - Memory Management Problems with Pentium Processors You have successfully completed all steps. Install the drivers for your hardware and your programs. Have Fun! ----------------------------------- KNOWN ISSUES: 1. If you plan to install the Microsoft USB Supplement to Windows 95 OSR2 (USBSUPP.EXE), be aware that this update will sometimes overwrite the file C:\WINDOWS\SYSTEM\VMM32\NTKERN.VXD without prompting you to keep the newer file already installed by this patch. If this occurs, the following error will be displayed: While initializing device NTKERN: Windows Protection Error. You need to restart your computer. This can be corrected by recopying the NTKERN.VXD contained in this patch to your system. ----------------------------------- LEGAL INFO: THIS SOFTWARE IS PROVIDED FREE OF CHARGE WITH ABSOLUTELY NO WARRANTIES OR GUARANTEES. BY USING THIS SOFTWARE, YOU AGREE THAT YOU USE IT AT YOUR OWN RISK AND OF YOUR OWN FREE WILL. THE AUTHOR(S) OF THIS SOFTWARE SHALL NOT BE HELD LIABLE FOR ANYTHING RESULTING FROM THE USE OR MISUSE OF THIS SOFTWARE. IF YOU MODIFY THIS SOFTWARE, PLEASE REMEMBER TO CREDIT THE ORIGINAL AUTHOR(S) FOR THE ORIGINAL CONCEPT(S). ----------------------------------------------------------------------------- This software brought to you by Conner McCoy (LoneCrusader) with assistance from Rudolph Loew (rloew). ----------------------------------------------------------------------------- ------------------------------------------------------------------------------------------ ***UPDATE 12-18-2010*** Slipstreaming instructions added Here. Microsoft issued a Hotfix for this problem in Windows 98 FE. It contains an updated version of NDIS.VXD that only works in 98. Apparently they forgot (intentionally? ) or never realized that the updated version of NDIS.VXD in the DUN14-95 update solves this problem as well. Of course this isn't going to do you much good if Windows 95 drivers do not exist for your hardware. If you have version 3.40.1001 of the Intel Chipset INF Installation Utility, it still contains 95 Drivers covering the 845 chipset, which I know was used on motherboards supporting up to 3.06GHz processors. The system used for this test: -------------------------------------- Motherboard: Soyo SY-P4I845PE Processor: 3.06GHz Intel Pentium 4 w/ Hyper Threading Memory: 512MB Kingston DDR 333 Video Card: ATI Radeon 8500 LE 128MB Audio & LAN: Onboard