Also a quick note of Virtual memory...
Virtual memory is hard drive space saved for use by the operating system to make up for shortfalls when actual RAM memory isn't enough. Most new systems have 12+ GB of ram and rarely have to make use of Virtual memory anymore. Back in the old days when a computer may have 64 megs for ram, having 100MB of space put aside for use by the operating system to store data on made a pretty good idea. Virtual RAM is slower(unless allocated on an SSD and even then somewhat slower) than actual ram since the computer is writing the data to a drive and accessing it again when needed, but it allowed more programs to be running or more data handled without crashing or having a pop-up saying please close your email program if you want to load anything else....
To my knowledge Video NEVER uses virtual ram, simply because there is no way it would EVER be fast enough to do the job. You system uses shared main RAM for video use and may actually be part of the problem depending on how much is in use when the video card is needing a bunch.