Hi all,, It very urgent So please reply as early as possible...... One of my client's Machine Stops (Hangs) during the booting of Win Xp On the WinXP Logo Screen. I Tried Recovery console options to replacing the system file but it didn't worked.... So then I Started to Repair the Win XP Installation... During the Copying of the Setup startup file to the Memory and just before the Massege "PRESS 'ENTER' TO INSTALL, PRESS 'R' FOR RECOVERY PRESS 'F3' TO QUIT"- THE BELOW ERROR DISPLAYED ON THE SCREEN - - - { "File mountmgr.sys caused an unexpecte4d error (12800) at line 5964 ind:\int\base\boot\setup\setup.c" PRESS ANY KEY TO CONTINUE.... and when I pressed a key, it showed.... "SETUP FAILED PRESS ANY KEY TO RESTART COMPUTER" } I removed the HDD and attached to another PC with the same configuration as the PC giving problem, and it worked all fine on that machine, I can be able to successfully Boot win xp pro and looged on with all the user account and all the installed programes worked fine as well......with no issue I worked smoothly for two-three hours. I again tried to Attach the HDD to its original PC and tried to boot but again the booting failed and the PC hanged on the WINXP Logo screen..... So can any one tell me what could be the problem with the PC.... I thought to Update the Bios and so Searched for the Bios but can not find after several attempts of GOOGLING.... Machine's Config is as given - - - - Program: eSupport.com BIOS Agent Version 3.55 BIOS Date: 03/07/03 BIOS Type: Phoenix-Award BIOS v6.00PG BIOS ID: 03/07/2003-8361-686X-6A6LNB0BC OEM Sign-On: VKQ0307T Chipset: VIA 82C3112 rev 0 Superio: VIA 686 rev 64 found at port 7h OS: WinXP SP2 CPU: AMD Athlon XP 1533 Mhz BIOS ROM In Socket: Yes BIOS ROM Size: 256K Memory Installed: 256 MB Memory Maximum: 512 MB Memory Slot 01: 0 MB Memory Slot 02: 256 MB 40 GB Seagate HDD 1.44 FDD Mother Board is of KRYPTON... eSupport.com, Inc. 1-800-800-BIOS (2467) Please let me know the probable cause and the solution for it.....as soon as you can. And please also provide me the link for the latest update of Bios Flash and .Bin files. You can mail me the details at dins.the.tech.digger@gmail.com Thanking You all, Regards, Dins'