The Master Boot Record on a computer got corrupt somehow, When I ran Vista's CD for a Startup Repair, and it allowed the box to bootup, however The profile wouldn't load properly. had to ctrl-alt-del, load task manager, and execute "explorer.exe" to get the desktop to show. then I noticed that nothing would load, and that everything was pointed to c:\. The drive is now listed as E:. is there a way to fix it so the boot drive shows as C: again?