The most important thing is the type of CPU you have, usually this is something like "Intel Celeron, Intel Pentium", etc, Video cards are usually things like "S3 Virge, ATI Radeon, ATI Rage Pro, nVidia GeForce"
There are utilities online you can download to give you this information, most people have this information available to them when they purchase the computer
i would try
http://www.sisoftware.demon.co.uk/sandra/
Also I kind of hinted at reading the faq jnes comes with a little, one of the things I wanted to know was exactly how fast it's running for you now, what options you are using, if turning sound off helps, etc....