Problem with c: icon under My Computer

Hey everyone I am running xp sp2, under My Computer the c: icon is the icon which specifies that an icon for that object can't be found, as though it's an unknown extension. Looks like a white page with a window inside, i'm sure you know the kind. Other than that it works just fine, any ideas what could be causing this? Btw the other icons including other drives under My Computer look fine

Thanks alot,
Michael