Wow! Thanks for all the useful suggestions and help!

In the past I've thought about overclocking my computer, but as some of you have already mentioned, it can be quite risky. So I guess for now I will try RamBooster 1.6 (from http://www.sci.fi/~borg/rambooster/index.htm, right?), and perhaps invest in a dedicated graphics card, hard drive (which I need anyways), and some more ram.

I guess I should have mentioned that it's an AMD K6-II. Also, the ram's clock latency is PC-100.

Thanks, I will give Xen a try. Correct me if I'm wrong, but is it located at: http://www.x9000.net

By the way, thanks VictorKaum for your in depth post! Very helpful!

Thanks again everyone!