Virtual memory is when it uses part of the hard disk like it was the type of memory that runs the programs.http://www.pcmag.com/article2/0,2817,2089076,00.asp has a couple of things you might have to do.
I'm guessing either some setting needs to be changed, or you may need to clean up the hard drive so you have enough space.
When you don't have enough memory to run all the programs that will bog things down.

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