|Try this, it works in XP. If it doesn't work for you, come on back and I'll move your post to the Windows 7 forum:|
Right click your Desktop
Look at the Background list
Down at the bottom of the list I think you will find the name of your photo.
Option 1 - Click Browse and see if it takes you to the folder that contains your picture.
Option 2 - Jot down the name of the Desktop Background and Search for via a Windows Search.
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