Okay lets do this

[LemonRising]

Well, is the 9100gt an addon card? And perhaps asking your brother might help.

Also download speedfan or a similar program and look at he temperatures for your hardware. I used to lag in most games after playing for 20-30 minutes because the graphics card kept overheating. For several months I thought another program was interfering or something but it turned out the GPU was overheating.

LOL you know, I was eating dinner, and I thought "you know what, my laptop over heated and had issues, that could be it. I should download speedfan."

My brother knows much less about computers than I do, and I don't know a hell of a lot. D:
but ah, if you mean, did we add on the graphics card after we bought it, no. The 9100 is what it came with, but ah, heres the page:
HP Pavilion p6152f Desktop PC Product Specifications HP Pavilion p6152f Desktop PC - HP Customer Care (Canada - English)

anyways I'll download speedfan and make sure thats all good there