I have fixed peoples computers because of how S....L....O....W... they are  and have seen very little RAM in these 5-10 year old machines.  One of the major fixes is making sure you have sufficient ram. In today's world I would say 2GB is that minimum. I use a company called Crucial. If you go to their page you can see on the front page a way to see what kind of RAM you might need. You can find your exact computer or download a program to see which RAM you need. Next, it will show how much it cost and the maximum amount of RAM you can install. It is easy.