What is vertual memory what do I do when it is full

>Moved to computer board<

Virtual memory is space on your hard drive used to supplement your RAM. You can increase the amount allocated for virtual memory. You can also close some of the running programs or get more RAM.

If you are interested Virtual memory - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Virtual_memory)

Another source Howstuffworks "How Virtual Memory Works" (http://computer.howstuffworks.com/virtual-memory.htm)