help me plz

I have put D2 Expantion on to the computer about a week ago......and the ping is shiiiit......I have a 55-65 FPS rate, 0 skip rate, and a 700+ ping rate....my connection speed is 2.4 Mbps as an internet connection and I run XP 2000......I have a P3 with a cpu speed of 800 mhz, I have over 500 mbps of ram, and over 20 gigs of space left.....anyone can help with this problem?.... and one more thing my graphics card is an Geforce FX 5200 (Asus V9520 Magic) Card 128 MB......plz help?

dam