\windows\system32\config\system I am not an expert on software or computers but XP has been nothing but a nightmare!!! Let's get the general idea from the biggest software developer in the world: Microsoft Knowledge Base Article - Q307545 When you try to start or restart your Windows XP-based computer, you may receive one of the following error messages: Windows XP could not start because the following file is missing or corrupt: \WINDOWS\SYSTEM32\CONFIG\SYSTEM Now the article doesn't describe the possible causes of the crash, at all. I am getting this error frequently. I have made several clean installations, the problem is not corrected. I have removed/installed the modem , network cards, sound cards an video cards. I have updated all drivers from MS update and from manufacturers. Before this errors appears, the computer checks the hardrives for consistency a couple of times. I am pretty sure it has to do with a driver as I recovered from following the instructions and chose the next to last recovery point. After a few restarts PC crashed again, same problem. It seems like the problem builds itself until causes the crash. 1. I need to know how to boot XP in DOS mode and be able to flash the BIOS 2. You think a driver can be causing this 3. You think my jumper settings on HDD can be doing this. I have removed the slave HDD and set my jumpers as Master in HDD 0 Help me please!!!