How to replace corrupt files?

Hi,

I have this really strange problem that my windows explorer keeps crashing when I open a folder that contains audio- or video files (no matter the format, really - happens with .mp4, .mp3 and sometimes even with .avi or .mkv). Same problem when I go to Start -> Search and search for one of these files.
I've already read quite a few posts about the same problem, however, none of the things described there really helped (disabling preview and the like). I also can't reset my system to an earlier point because when I tried to create a reset point (or whatever you call it) some weeks ago for some reason that didn't work.

I did, however, manage to do a successful sfc /SCANNOW (log should be attached), which couldn't repair all files.
What I conclude from the log is that apparently 'mf.dll' is rather seriously corrupt.

So my question is: How do I get a non-corrupt file?
(Would it suffice if, say, someone uploaded one and I simply replaced it manually? If not, what else can I do? Booting from the Windows Installation CD and doing about every repair there is didn't solve anything.)

I'm running Windows 7 Home Premium x64 with SP1, in case anyone wants to know that.

Thanks in advance.

Attached Files

sfcdetails.txt (40.2 KB)