Windows Movie Maker(Windows Vista)

I made a album on windows movie player and everything was just fine. The
album played perfectly video and audio. Now today I go back to watch the
album and most of my pictures had been removed. Not only from my album but
completely from my PC file(pics). I tried browsing for them but was not able
to located them in any file. This album was of great value to me due to the
pictures of my deceased father and recently deceased mother. If anyone has
any idea of how I may be able to recover my pictures please respond soon.