Try booting into Safe Mode options by tapping the F8 key during the boot sequence. In the Safe Mode options screen, select "Last known good configuration" and press "Enter". If that option won't work, try to boot into "Safe Mode". If you are able to start the machine in either of these options...
...type sfc /scannow
(Note the space between sfc and /) and press "Enter". You will be asked for your installation cd, so have it handy. Wait for the scan to finish (this might take up to an hour).
When System File Check has completed, click Start
...type chkdsk /x
(Again...note the space) and reboot when prompted (type Y and press Enter). This will run on boot-up so restart will take a while...be patient. (It wouldn't hurt to run this one twice)
Let us know how it goes...
Edited by wannabe1, 08 January 2006 - 10:25 PM.