Not sure if it works on XP, but worth a try.
Right click the folder and select Properties. Is there a "Customise" tab there? If so, you can change what the folder is optimised for there.
I find that some of my folders have headings that would be appropriate for collections of songs. I can go in and individually change the headings, but I once found a way to tell the OS that that the folder was not a song folder.
I can't find that again. Can someone remind me of what to do?
I am running Vista 64 bit version