Missing system32/drivers/pci.sys
Do you have a Windows XP install CD? If you, you can boot the Recovery Console from it by entering R at the first opportunity. Once you get to the command prompt, enter chkdsk c: /r Do not disturb, let it run to completion. This can take a while depending on how large the hard drive is. Reboot and see if that resolved the problem. If not, boot the Recovery Console again and enter expand d:\i386\pci.sy_ C:\WINDOWS\system32\drivers\pci.sys d: would be your CD/DVD drive letter C: would be your boot drive Info on the expand command here: http://pcsupport.about.com/od/termse/p/expand.htm If that doesn't resolve it, you can use Puppy Linux, a Linux Live (bootable) CD to save your data then do a reinstall of XP. See this post by Happyrck on GeeksToGo for some very explicit directions on using Puppy Linux. http://www.geekstogo.com/forum/topic/192486-help-with-windows-xp-wont-start/page__p__1197721#entry1197721