Windows 7 - Trying to play TF2

Hey, I really want to play TF2(Team Fortress 2) but I don't think my graphics card is good enough.

Basic Information:
1.40 GHz
504 MB of Ram
Dell Inspiron 2200
Laptop

Need To Update Drivers:
I'm right below the lowest requirements. I'm wondering if my drivers aren't up to date?

Cleaning:
I've already cleaned out my computer with CCleaner to free up space and changed my virtual memory to suit my comp for the best performance.

Graphics Card:
Also if it's my graphics card(check my profile info)that's the problem can I replace it(I've heard most laptops can't be configured with a new graphics card)? But I've also read that the Inspiron 2200 can be configured for gamers.

ummm you might can play it at low graphics..... but even on my computer it pulls sometimes...... chances are you need a new machine though

It can run but it lags really badly at low settings.

yes.... tf2 uses up some computer haha its fun though...... but yea you need to build a new computer to play it without the lag