After you have pressed "OK" to log on, go to the Start Menu > Control Panel > Network. After the Network window pops up, there should be a box to choose from down near the bottom, saying "Microsoft Network blah blah". Change it to "Windows logon blah blah". When I say "blah blah", I mean, I don't remember what they're called :grrr:
Hope this helps ya!
Hope this helps ya!