Low Virtual Memory?

I just got a bubble down on the bottom of my screen that says my computer is running low on virtual memory. When I hit ctrl, alt, delete it says my comp. is running at about 90% capacity. I have used McAffee to scan for viruses(no results) as well as AdAware and SpyBot for spyware searches(no results) and my... show more I just got a bubble down on the bottom of my screen that says my computer is running low on virtual memory. When I hit ctrl, alt, delete it says my comp. is running at about 90% capacity. I have used McAffee to scan for viruses(no results) as well as AdAware and SpyBot for spyware searches(no results) and my comp. is still running extremely slow. What can I do to fix my problem??
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