If your Windows Live Photo Gallery freezes, crashes or does not start in Windows 7, it is quite possible that the database created by Windows Live Photo Gallery to track photos and videos may be corrupted.
Windows Live Photo Gallery database corrupted
To fix this problem, you have to regenerate the database for Windows Live Photo Gallery as follows:
Close Windows Live Photo Gallery.
Open explorer.exe, type %userprofile%\AppData\Local\Microsoft\Windows Live Photo Gallery in the address bar and hit Enter.
This will open the Windows Live Photo Gallery App Data folder.
Here, delete any existing instance of “OLD_Pictures.pd4” and “OLD_Pictures.pd5.”
Next, locate and then right-click “Pictures.pd4” or “Pictures.pd5.”
Rename “Pictures.pd4” to “OLD_Pictures.pd4” or rename “Pictures.pd5” to “OLD_Pictures.pd5.”
Now restart Windows Live Photo Gallery and see if all is fine!