I reviewed your posts on the computer help forum (you really should note them here--it will help). Please try to see if you can run a command prompt from the RUN panel--Click start, then RUN and enter CMD in the Open line. Click OK and see if that opens a cmd.exe window.
If not try clicking on Start then Programs and open Accessories. Click on the CMD prompt there and see if that does the trick.
From the cmd.exe prompt you can try to run the sfc /scannow command (with the Windiws CD in the drive) and perhaps then you will correct the problem.
When I type in MSCONFIG in the run box it says that it is not a valid Win32 application. Basically I'm trying to boot in "safe mode" but it wont work when I press the F8 key during start-up....