tamborine, you know absolutely nothing about computers, I really wish you would stop giving 'advice' on this topic!
kenny1234, there would be no downside to getting some new RAM installed as long as your PC can support it. To check if it can you could go to
http://www.crucial.com/uk/ and do a scan of your system (perfectly safe), click the 'system scanner' link to get started.
The scanner will tell you what is already installed and what the computer can support, it also gives you the option of buying the RAM chips from them (very reliable, have used them myself) if you feel confident in fitting new RAM yourself.