I got a new motherboard, and for some reason when I try to play a graphics intence game like Americas Army, the game hangs every few minutes.

I'll be running, hit and all of sudden, the game hangs like a son of a bitch. I keep running, but I cant stop, can't talk, cant bring up any menus, all I can do is use my mouse to turn and pray I dont run anywhere I souldn't. If it happens when I'm typing i'll be trying to say "enemy right" and it will slowly go "e" then after about a second "n" then another second, "e". Then all of a sudden go real fast as it catches up and "my right" shows up in a blink of an eye and sends.

Anyone haev any ideas?

Like I said:
XP Home
1.0 gig of Ram
asus p4p800 se motherboard
Pentium 4 2.0 gHz
Soundblaster Sound Card (not an issue)
nVida GeForce Ti 4420

and this didn't start happening until I got the new motherboard. Could it be the mobo is too fast for the video card or something like that?