SIgh.
First thing to check is bad sectors, low level way.
Download Linux Live boot cd (ubuntu, ...) for badblocks tool
sudo badblocks -sn -c 75000 -v /dev/hda
(or sda is seen too...)
IF that is succesful (no sectors are mentioned anymore), you should be able to run a chkdsk. If not, might be virus, but it's not first thing to think off.
Try chkdsk with right-click properties on C:-drive (under Computer). Also fails?
Do sfc /scannow from elevated command prompt (cmd.exe). Restart computer, try again.
If not, repost for instructions on boot-time registry flags...
Karma!
Devvie
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