i'm not even sure how virtual memory works even after i read some info on it on the net, but i got a message sayimg mine was low. i discovered i could increase it by going to performance options and increasing it. i changed the initial size mb from 192 to 766, and the maximum from 766 to 1500. i don't even know how it effects anything,but the pc works the same. my maximum ram is 512 in this older pc and thats what i have. i've never had any problems with it but whats up and am i o.k. or what? how serious is it?