When I tried to turn on my PC that runs windows vista my computer went through and deleted corrupt files. It's done this in the past but no harm seems to have been done. After that I got stuck at a black screen. The computer was still running, but the screen was black. I tried again and it got stuck at that same black screen right after the HP logo showed on the screen (it always does that at startup). I went into startup repair next time and it fixed any errors it found, but the same thing happened again when I rebooted my computer. I tried startup repair once more and this time it said that no OS files were found. Is there any way to fix this? What would cause that to happen? Are the files that were on the computer still on there and will I be able to access them again if I ever fix the computer?