I was told to match up my sticks of RAM so they will be compatible. I only have 256MB of RAM and I keep getting the message, "virtual memory is to low". My wife went to Best Buy and the Geek behind the counter said they don't carry that anymore and we'll have to pay around a hundred bucks to get one on line. I need to know if this is true. Can I get a stick of RAM anywhere that is compatible? It doesn't have to be another 256 stick does it?