This is the fix i discovered for Windows 7 64 bit Latest RC. Dual Quad etc core.
1 click properties and go to Compatibility tab
2 run with Windows XP Service pack 3
3 chek all other boxes there.
4 Start StarCraft then pres alt+tab and go to Task Manager
5 Find StarCraft.exe in processes then right button Set Affinity...
6 Make it run only on CPU 0
7 Stop Processes that use most of your CPU such as Sidebar Bittorrent ETC
7 All processes that you want to use that are soft of your choosing like Winamp Skype ETC make them run on the other CPU(s) not on CPU 0.
It's Done you shuld be able to play Starcraft in LAN etc without having your system crash avery 15 minutes.