Whats going on?

So Ive been waitin for the beta to come out forever... it does, I get it, I join a multiplayer game, I get in, my pings in the 30's, I try to move and I begin lagging uncontrolablly.....So I look at my ping again.... its still low.... It cant be my comp... and I have a cable connection... Whats going on?

Specs:
2800 AMD Athlon
120 Gig hardrive
512 MB Ram
Radeon 9800 PRO 256MB
Win XP

Try some other server. It might be a dead-stop bug.

Ive went to many different server. It doesnt matter where I go, Ill have low ping, but Ill be unable to move.

Check your Network Settings. They may be set incorrectly.

i too will have this problem like if i'm at the inventory station and i'll just stay there and try to move andi wont be able too. i usually just wait 5 seconds and dont do anything and then jet and im free