Need to explain a bit better as to what is happening. Harddrive or computer? What do you mean by "backup disk", do you mean the restore partition? What "made it all the way" exactly? Did you do a system restore?
If it does not work properly, could be a RAM issue or a hard drive issue, along with some smaller chances of several other things. Try different RAM, you may need to try a new hard drive as well, and use an XP disk to install Windows.