After spending days trying all possible solutions to the notorious vista 60 second wireless lag problem, the obvious answer hit me in the face. Don't go wireless! Oh but you're in a room where a floor or two up from the router and don't want to start drilling holes or running wires around? Same here.
This product (or any others like it) has solved my problem
Newegg.com - NETGEAR HDXB101 Up to 200 Mbps HD Powerline Kit - Powerline Networking.
Plug 1 end into a socket near ur router/modem, plug the other into a socket near your computer, connect ethernet cables, walah.
Easy, fast, and best of all your computer just thinks you're plugged into a router so no more vista wireless crap.
I love vista but...microsoft really dropped the ball on this feature. This may not be the best solution, but it will do for now. Hope this helps.