You did an upgrade from xp to win7 or a clean install of Win7 - reason I'm asking is - you shouldn't have been able to upgrade from xp to win7 (vista yes, which is still problemattical (library issues/search not working etc)).
If you did an upgrade, I'd recommend a full clean install of win7 to clear out any lingering xp resources (which wont work under 7)
If not, you might need to redo your settings from scratch - if nothing else, you'll be sure you've mapped em right.
Wurz