Graphics Card help pls

Obey the Rules No flaming out side the Flame forum!!!
(Please don't flame me if i sound like a dumbass i obviously am when it comes to my graphics card)

I changed my card to a GeForce 4 MX440 SE (don't know if it sux but it's better than the one i had before)
& i sware that since it's been in iv'e lagged like hell on every thing, even just opening up an internet window to my home page is slow. It's not my connection & I dont have other programmes running.

Trying to play on line games is silly lagg is so bad
my ping is ok, its not spiking but my FPS is running at about 10-20

Please help me, think it might be a problem with the card? or maybe one of the hamsters that is powering up my pc has died???