With regard to the 12NOV2005\SVC-HF1 folder I have the following differences: files I have not on this location: Q282784_WXP_SP1_x86_ENU.exe Microsoft has released a command-line tool that easily enumerates all of the installed fixes by Microsoft Knowledge Base article number. Customers can then confirm that they have installed the appropriate set of fixes before using a valuable support incident and potentially experiencing unplanned down time. WindowsXP-KB883939-x86-JPN.exe Security issues have been identified that could allow an attacker to compromise a computer running Internet Explorer and gain control over it. You can help protect your computer by installing this update from Microsoft. After you install this item, you may have to restart your computer. WindowsXP-KB885222-v2-x86-JPN.exe After you install Windows XP Service Pack 2, some 1394 devices (such as digital cameras that use S400 speed) may not perform as expected. Install this update to help prevent this issue. After you install this update, you will have to restart your computer. WindowsXP-KB885626-v2-x86-jpn.exe This non-security critical update helps resolve an issue where a limited number of systems running a BIOS without production support for Intel Pentium 4 and Intel Celeron D processors based on Prescott C-0 stepping can potentially hang on Windows XP Service Pack 2 installation. After you install this update, you may have to restart your computer WindowsXP-KB886677-x86-jpn.exe This update addresses an issue where double-byte character set (DBCS) characters may appear corrupted in Internet Explorer on Windows XP when you browse a Web site that uses Shift-JIS character encoding. Install this update to help resolve this issue. After you install this item, you may have to restart your computer. files I have and are not in the presentend list: WindowsXP-KB899588-x86-ENU.exe A security issue has been identified in the Plug and Play service that could allow an attacker to compromise your Microsoft Windows-based system and gain control over it. You can help protect your computer by installing this update from Microsoft. After you install this item, you may have to restart your computer. So in total here are 41 I have 37 hf. After installation only the following optional software is represented to me by windows update: 829019 dotnet 2 891122 WDRM enabled mediaplayers so perhaps there are some hf not necesarry for my system or there are some updates which are included in newer ones in the list of 41