Memory shortage with Doom?

[Soccer1725]

I have a question about memory. By system specs are listed below. I am playing doom3 and sometimes the game will start to run very slow. When I end the game I find out that there is a message from windows telling me that my virtual memory is too low. I turned it up to 1GB min and 2GB max and that seemed to help a little, at least I don't get the message anymore. How does virtual memory enter into the mix here, my card is only 128MB but my RAM is 1 GB, shouldn't that be enough memory. Is memory getting lost somewhere?

[zelda86]

hi all
I suggest you go to the control panel and double click system icon and goto advance then to performance, set performance to best possible performance.