because a lot of stuff is integrated into a labtop, meaning it can't be upgraded, and theres so little space and alot of times you need special parts that can be hard to install. And lots of other things that just make u go grrrrrrrrr.
Anyways 598 mhz is the FSB (Front Side Bus) of your processor. All's you need to know about FSB is that more is better :P.
Heres a rough idea of things you could do, I would reccomend a new processor, another stick of 512 mb of ram, and a video card if you like to game.
I would post links to what exact processor you should buy, and what exact ram you could buy, and what video card, but I don't know what motherboard you have so I don't know what kind of parts you have.
Download everest as the other person said;
run the report wizard, (hit the report button on the top bar and then hit report wizard.) follow the steps,
When you get to the page in the report wizard that says "Report Profile" select all pages, then hit next. You can put it into HTML or plain text don't matter, i think the html version is easier to read. Then just post what it says up here and we'll be able to help you more.