I had a strange situation. I went away on a holiday for a week, before going everything was OK with the computer, came back, turned the computer on (it was off during my holiday) and it started scanning for hard drive errors. It took couple of hours and then the computer started up, but was very slow, AVG wasn't working, none of the Office applications was working and was pretty unstable. I remember seeing NTFS message somewhere, probably in Event Viewer. That was all on the C-drive, the other partition on that hard drive seemed to be OK though.
I tried chkdsk /r, it took 4-5h and ended up with a lot of errors and don't think it completed with a message "errors have been fixed" or something similar.
At the time I only had that hard drive so I decided to install new Win7 on the other partition. After I did this I haven't managed to access the damaged partition any more. By now I have bought new hard drive, installed Win7 on it and run chkdsk /r and chkdsk /f on that hard drive but they all fail after an hour of scanning and the partition is still inaccessible.
Any thoughts how I could get that partition to be recognized again by Windows?