[InuTrunks]

There's a program out there called "Set Affinity" (I think that's the name of it, I can't remember, I don't have it anymore, but it's nice), which will allow the OS to "remember (via the program) which affinity to set which program when it starts up (so you don't have to change it all the time).

Normally, what I do (manually) is set all my major programs to core 0 only (unless they support dual core, then I leave them be), and all my background processes to core 1 (like AIM, FireFox, ect). You want all your MAJOR system processes set to core 0 (windows won't like it on core 1 for some strange reason).

Edit: You have it backwards, even though it's "core 1" that's core "2", logicly, all computer counts start at 0, not at 1.