Folder Customization

I am having a Problem with Win XP SP1 system.
My Folders automatically gets customized as “Photo Albums (best for Fewer files)” even if the folder does not contains any Photograph.
I again and again change them back to “Document (for any file type)”.
The Problem increases when the folder is My Documents or C:\Windows or directly C:\ because when you see their properties, the Customize tab is not available.

Why do the folders automatically change their customization?
Is their any solutionfor them?

Also how do I change background picture for a folder in XP?