Isnt Virtual memory the Paging file.... maybe you dont have a paging file set on ur drive...
Right click on My Computer, Click properties.
Go under the advanced tab and click the settings button under performance.
Now go to the advanced tab in that and click the change button in virtual memory
Click on what ever harddrive you want it on
Click on custom size
Fill in 2048 for the Minimum and 4096 for the max
click set
then ok and apply
should ask you to restart
hope this works