Recycle Bin Help

I'm running XP Pro, and just recently I've been having
problems with my recycle bin. The icon always indicates
that there is something in there pending deletion, but
when I open the 'bin there is nothing there. However,
when I press 'Empty Recycle Bin' it puts up the
message "Are you sure you want to delete 'Windows'?"

Please help, it's annoying me somewhat.

Thanks,
Stephen Wigfield