HI! My computer is trying to die I think. When I sat down to do some work, it had a black screen and said that there was an error with the windows OS. I searched for repairs on another computer, but none of them worked. My computer won't let me repair the windows file. I do not want to delete all my files. Someone please help!

A repair installation should work for you
A Repair Install will replace the system files with the files on the XP CD used for the Repair Install. It will leave your applications and settings intact, but Windows updates will need to be reapplied.
A Repair Install will replace files altered by adware and malware, but will not fix an adware, malware problem.

Perform a Repair Installation

Have you tried to get into safe mode?
What happens when you turn on your computer?