I'm running Windows 7 Home Premium 64Bit on my PC, have 4Gb of Ram installed but looking at buying some more Ram sticks later on this year, I might even see if I can get faster Ram while I'm at it, anyway, I've found that some 32Bit plugins don't always behave like they're supposed to when run on a 64Bit system, some even refuse to load let alone work at all, then again some of the 32Bit plugins I've tried have worked perfectly well.