Game lag... tried everything... new video card?

I have been having lag on all my games including WoW and Team fortress 2. I used to be able to run them smoothly on high settings but now on WoW I lag on the lowest settings. WoW is a very easy game to run. This doesn't make any sense at all considering I have windows vista with an nvidia geforce 9100 video card, an amd phenom quad core processor, and 5.7gb RAM



The lag seems kind of strange. For example, WoW will say I am getting 30fps, but it will feel like 3fps. It seems to slow down and speed up rapidly.



I got a new modem and had my isp check my internet connection. So it is not my internet. I reformatted my harddrive and restored my computer to its factory settings so I don't think it is a software problem.



It must be a hardware problem, but I'm not sure if it is my video card. your thoughts?|||Sounds like your internet connection. Is it wireless? Maybe some neighbors are borrowing your bandwidth? Maybe too many programs running in the background? Maybe it's the specific server you're playing on?|||Your graphics card. It is integrated and will not play games at playable frame frates. Upgrading to a dedicated graphics card will run those 2 games better. The rest of your PC specs are good.