virtual memory low please read

Virtual memory is the 'Pagefile' on your PC.

In addition to your system's RAM, your PC uses an area of your hard drive which is set aside as a pagefile. Data that is bigger than any RAM available is written to the pagefile, then read back into active RAM as and when required.

This is a common process for all PCs.
However, depending on the programming skills (or more importantly - lack of them) a system call can occasionally be made to a portion of pagefile that does not exist. Also, your pagefile, like any other file on your hard drive can become fragmented - meaning the pagefile does not have 'enough virtual memory' to accommodate the required file transfer.

This usually happens if you are running multiple applications to excess.

In order to defragment your system file you should delete it before invoking a defragmentation program. This way the hard drive defrag benefits from the sudden injection of available free space to help the defrag process, and the pagefile benefits from having a fresh area of defragged free space in which to be created again.

What had you just fixed on your PC ?
How much actual RAM do you have ?

You can adjust the virtual memory by right clicking the my computer icon, slecet properties then select the advanced tab.
You can adjust the minimum and maximum virtual memory parameters there