Having the same issue here. It just started happening, had W7 x64 for just a few days but it wasn't happening before. Total memory usage doesn't add up... I'll check in here if someone can help us know what's going on. Right nos, 3.6GB in use out of 5, and I'm doing nothing, and it doesn't add up to what each process is using. The one using the most is svchost and only 12MB. However, there are 11 instances of it (each with a different thing written between '()' ). What intrigues me is that adding up every process memory usage it doesn't get remotely near 3.6GB