I'm using Windows XP Media Edition.
Last night (I think) I downloaded a file to a folder. I haven't opened that folder in a while - a week or so - but when I tried to today - or opening any folders within it - I get an error saying that Windows has encountered an error and has to close the window (and along with it, all my other folders that are open). I've never had this problem with my music files before - this folder contains what music and videos I have of a music group, and there isn't any file format that I don't have in another folder that opens perfectly fine.
What could be causing this error, and how do I fix it?