I just got a hp pc with vista installed and i just bought pt le 7.4 and i'm having buffers size problems and i'm convinced it's a version 7.4 problem. And i want to go back to 7.3 but vista only works on 7.4. I know that max ram on xp is 4 is that enough for me to work with pro tools with plugins. I got like 10 softsynths i know i won't be using them all at the same time is 4 gigs of ram to use a decent amount of vst plugins with pro tools.