Is there possibly anything I can do on the computer as opposed to purchasing another stick of RAM. I read on some other post something about virtual memory, but I didn't quite understand what it was getting at.
"Virtual memory" refers to using your hard drive as RAM in the event that all of your RAM is being used up. This is referred to as a "Swap file" or "Page file": When all of your RAM is being used up, it will store temporary files on a section of your hard drive reserved as the Swap File. When those files are needed, it will take memory out of RAM and 'swap' it with memory stored on the hard drive. This drastically slows down your computer's performance because now, in order to access certain data, it has to take files off of RAM, store it on the hard drive, and then take files from the hard drive, and store it in RAM before it can be processed.
A 32-bit OS can only utilize up to 4GB of RAM. You can still utilize the 4GB of RAM that you purchased by removing the two 1GB sticks, and placing the two 2GB sticks in their place. Unless your motherboard requires that both slots of Channel 1 be used before it can use Channel 2, I would recommend putting a 2GB stick of RAM in both channels to fully utilize your Dual Channel motherboard.