Just had a quick look around and it seems to be one of those problems that has various causes, the simplest things to try are to unplug all USB devices, including mouse and keyboard (or disbale USB from BIOS if you can) and seeing if it boots past the error, if it does plug everything back in and see if it works then.
The other is to remove the PCI cards from the comp, reboot if it works put one PCI card back in reboot.....etc adding one card each time. Dodgy memory(also check if it's loose) and CPU been named as possible causes.
Also which flavour of windows are you using?
Is all of your work on a diffrent drive to the C drive?
If it is then try putting the windows disk into the CD drive this will either fix windows or re-install windows. As long as your work is on another drive when windows boots up you will be able to reach it.
If you do re-install windows then you will have to install office again or the software that you use to run your work.
Hope this helps
Molly xx
Try resetting your BIOS back to it's default settings.