I had a similar problem which manifested itself with individual files as opposed to folders. For some UNKNOWN reason, when I had copied some files to another folder, they became read only. I did find a fix though, if you boot into safe mode, then you can reset your security/file sharing settings.
That was the fix for the Home edition, XP Pro I think is different. Try reading the following site which I think was one that I looked at when I had the problem. It talks about not being able to move or delete a file (my version of the problem). It should work for folders.
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