If you had told us what kind of photo editing or viewing program you use there might have been several answers by now. Since you didn't, here's an alternate way to find the photo.
Click the "orb" at the bottom left of your Vista screen. Type in the name of the file you saved (assuming you remember at least part of the name) and it should find it for you. Then, right click on the file, click "open with" and select your photo program. Once there, save it wherever you like.