Enormous virtual and private memory usage on a Windows 7 x64 Installation

Enormous virtual and private memory usage on a Windows 7 x64 Installation

recently my Windows 7 x64 machine started to act very weirdly, a lot of programs would crash randomly. The one application that would consistently crash was Team Fortress 2, after loading a map, I suspect it is because it uses a lot of memory. Also my hard drives are trashing constantly after a while, but I can't see any significant IO going on with Process Explorer. This could indicate page file trashing.