That's a really, really, really, terrible PC. I used to have one very similar to it, and basically there's very little opportunity for you to play anything that came after 2002 unless it's on the Source engine (Half Life 2, Portal, Left 4 Dead, Counter-Strike: Source) and even games on the source engine aren't going to perform too well, but they should be bearable on the lowest settings.
I really doubt you'd be able to play Battlefield 2, as I remember when I had a laptop with very similar specs I was having a hard time just trying to play Battlefield Vietnam which came out a little over a year prior. You can stick with Battlefield 1942 for the most part, as well as games like the original Deus Ex, and Age of Empires 2 HD (with all the eye candy like 3D water and anti-aliasing turned off) pretty easily.
You could also probably play Serious Sam Classic pretty well too, as well as most games which use the Quake engine such as the Star Wars: Jedi Knight series. The original Red Faction should be quite playable as well (though not Red Faction 2) and you could play Grand Theft Auto III and Vice City pretty easily too. San Andreas would be a harder, but if you keep the settings low for San Andreas it should be playable.
Overall you should consider getting a new laptop if you expect to do any real gaming.