virtual memeory is space on your harddrive that the Operating System uses when you have used up your ram, so either you dont have enough ram or your virtual memory settins are too low, you can check your ram and vitual mem under the control panel using the system feature.

I agree with the other posts as being problems. Your best bet would be to scan for spy ware and viruses first, then uninstall programs you dont use, run disk cleanup, and then degrag, if that doesnt work you might want to put some more ram into it.