This thread talks about removing and reinstalling PP2 in order to gain PP3 in Windows updates with success...

http://social.microsoft.com/Forums/en-US/whssoftware/thread/d753e949-0bf8-48fe-88f0-278b99491ef1/

Sounds like it would be easy enough to try.

 Thanks. I will have to try that. Seems really stupid that one has to do this. Microsoft needs some real competition.