To be quite honest i have had this issue with faulty hard drives.
In your case the first step i would take is to repair the operating system. Get a Winddows XP PRO cd and put it in the CD-ROM restart the computer and boot from it. In Windows Setup you will be "forced" to agree to the EULA, Windows will then search for previous versions of windows select "repair" by pressing R. Windows will the delete all of the motherboard and bios drivers, ensuring a proper match and usually eliminating blue screens. But like i said its usually the hard drive. And if thats the case, print these instructions:
We'll start by assuming you have a hard drive inside the computer and savvy enough to remove the case.
1. Purchase a SATA - IDE - USB Connector. Trust me, they will know what you want.
2. Not sure of make and model but most cases screw together in the back.
3. Remove the screws on the side where aren't any plugs.
4. Slide the side off.
5. Inside the computer there is usually a hard drive mounted, somewhere under the CD Players and always has screws in it, most of the time if it has little plastic HP\Compaq plastic pieceson the mounting bracket, the drive slides right out.
6. Open the new connector from the store.
7. Locate the appropriate connection. SATA will have a connector about the size of the finger nail, but computers that go "caput" these days are still IDE, which looks like a long flat ribbon.
8. You will notice the connector has different sides to it, one of which is for smaller laptop hard drives, DO NOT use it on the desktop or you will caput the hard drive by possibly bending pins(No ones and zeros for you!!)
9. Connect the appropriate adapter to the hard drive.
10. Locate USB port on back of computer.
11. Plug USB side of connector into the USB port on the computer, it will be a small rectangle, often located next to the phone looking thing but bigger.
12. The Orphan hard drive requires power and you should find the power adapter to the hard drive.
13. Plug the power adapter into the hard drive FIRST.
14. Plug the adapter into the wall.
15. Your hard drive will be recognized and more than likely something will come on the screen asking you what you want to do with it.
16. Double click the folder icon or the one that says browse files or view files.
17. You will see the contents of the hard drive.
18. Double click on Documents and settings
19. Locate the name of your folder sometimes its just administrator, in any situation open each of those folders and you are looking for (Desktop,My Documents & Favorites) folders, these have ALL data. Except for programs like quickbooks, as quickbooks usually keeps in in another folder but for these purposes won't go there.
20. Move these folders to your desktop, just drag them one by one and verify everything is there.
Best of luck and regards
Custom Flash Drives