I wasn't trying to put you down, please don't take it that way.
Apple does a fine job of keeping their software suppliers in line, while MS seems to be in ongoing uphill battle to be everything to everybody all the time and constantly exposing themselves to some kind of hack/virus/malware/worm etc.
Apparently they are now trying to enforce this digital signature thing and making it harder to do things that were easier to do with XP and Vista.
Workarounds have been posted.
Try this one for the driver.http://arduino.cc/forum/index.php/topic,118089.0.html