Missing files in Photoshop Elements 8

Question

I just upgraded from PSE 7 to PSE 8.  All photos in PSE 7 are viewable, crisp and clear (about 7000 photos going back to year 1999).  Each year I make new folders of the events for that year and keep them under my Photos folder on my "D" drive (have one HD partitioned into a "C" and "D" drives).   In 2010, I made folders for various events and titled them according.  Example are 2010 - Easter; 2010 - Hawaii, 2010 - Convention, etc.  All of the earlier photos (prior to 2010) for 2009 and earlier years "converted" without any apparent problems in PSE 8.  Several of the 2010 folders also converted without any problems, but the three most recent folders of photos show as blurry thumbnails in the PSE 8 Elements Organizer screen and when clicked on say "searching for the missing file".  The file cannot be found.
As far as I know there is no difference from the way these 3 folders of photos are titled and were imported into PSE 7, where they continue be viewable as sharp photos.  In other words, in PSE 7 there is no problem but in PSE 8 these three files of photos cannot "be found".
Anyone have any idea what the problem is and how to overcome it?  If not, then I guess it was a mistake to upgrade from PSE 7 to PSE 8 as PSE 7 is working perfectly.  Best bet is just remove PSE 8 until this problem is fixed??? 
Running Windows Vista Ultimate.       

Answer 1

Found the solution. I cloned the drive like you did and PSE became confused since there are now two drives with identical volumeid. It kept pointing to F: when I wanted to point to C:.    I cloned C: when I installed F:    so both F: and C: now has the same volumeid. Download volumeid from microsoft and verify that they are have the same volume id by typing vol C:    and then vol F: . After verifying that they both indeed have the same volumeid, type volumeid F: 1111-1111. Basically change the volume id of F: to 1111-1111. Reboot and PSE should now point all the files to C:
See here for more detailed explanation:
http://johnrellis.com/psedbtool/#_Detecting_Problems_with