Help with nVidia Geforce 6200 =X

I just bought the Geforce 6200 and installed it yesterday and to my knowledge I did the installation correctly and have been able to play my games and notice the increase of graphics quality but since I installed it I have been getting booted offline from the games constantly and the games I have been getting booted off I have never have had this problem with and some games I can get on and sit there for 20 minutes plus without having any problems but other games I get booted within 2 minutes or less.

I read somewhere that if you have a bad graphics card it will often boot you offline and it would do that to me sometimes but would never on other games and now with my better video card it does it on games that I wouldn't have that problem with.

So if anybody has any information or solutions to this problem I would greatly appreciate your help.

What games are you playing? I've never heard of this issue having any relation to a video card problem.

I've been playing War Rock, Counter-Strike:Source, Hidden: Source, Day of Defeat. It used to never boot me off my net on Hidden: Source and my video card was terrible and now with my new one I wont lag at all but it will boot me off constantly and it wont seem to boot me off WoW at all.