My Music Missing

I have a pair of 250gig hard drives, C and D, in a Windows 7 box. I keep all my data on the D drive. I set up My Music on the D drive, filled it full of music (30 gig or so), and pointed the Music library at it. All fine, for the last several months.

Yesterday I found the My Music folder was missing from the D drive. One minute it was there, playing tracks with WMP, the next the tracks stopped playing, and upon investigation the folder had gone. Nobody was even using the PC when it happened.

The odd thing is when I do a search for *.mp3 on the D drive, all the missing files are shown, with a path of D:\My Music\...

I can't play any of the files found by the search, and I can't copy and paste them.

A WinDirStat scan of the drive doesn't see the files and scanning the drive for deleted files with a data recovery tool (Recuva) also doesn't show them.

Really stumped, any help gratefully recieved.

Thanks Brink.

Followed those steps, looks like the default had reset to C:

Update on some other stuff: I ran a deep scan that has found all the mp3's as deleted files, with a broken path (D:\?\). I ran Chkdsk /F /R /B, hoping that would fix the broken indexing. No joy, though several errors were found and fixed.

Looks like I'll have to restore the files with Recuva, but it doesn't look like the original folder structure is available. Annoying.

I restored the default location to D using the steps you provided, but no joy sadly. Doing the manual restore now.