Resetting your Windows Photo Gallery Library

I kind of like using Window Photo Gallery in Windows Vista. Its a nice way to display and browse my photos.
But recently I moved my photo collection and Photo Gallery “lost” most the photos.
There didn’t appear to a way to delete a photo from the gallery without deleting it from the disk as well.
After some searching I found that what you have to do is delete or rename the file

C:\Users\[username]\AppData\Local\Microsoft Windows Photo Gallery\Pictures.pd4

via deleting photos in windows photo gallery – Vista Forums.