Why use virtual memory anymore?

Cyberhwk writes: I have a system with windows vista ultimate 64 bit installed on it and it has 4 gig of ram however when I've been watching system performance my system seems to divide the work between the physical ram and the virtual memory so I have 2 gig of data in the virtual memory and another 2 gig in the physical memory. Is there even a reason why my system should even be using the virtual memory anymore? I would think the computer would run better if it based everything off of ram instead of using all physical ram instead of virtual memory.

Any thoughts on this matter or could you explain why the system is acting this way? As far as I know there could be a perfectly good reason for this however it does not seem to make any sense to me, as it seems that this would impact performance.