I have a Windows Vista home premium computer with an NIVIDA 8500GT graphics card with 256MB, an Intel Core 2 Quad Processor Q6600 each core operates at 2.4 GHz, 2 x 4 MB L2 cache, 1066 MHz FSB. I have a 500 GB SATA II hard drive. Dual channel 2048 MB DDR2 memory, Memory Card Reader 15-in-1. I have a 32-bit operating system and 2030 MB of rams. My problem is, however, that I have constant game lag while playing all next gen gaming titles (offline). Games such as Bioshock, Jericho, Call of Duty 4, ect. I am not able to play these games on the highest graphic settings without lag, (sometimes not even fair graphic settings). I don't understand why.
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Hi-- I'm no gaming expert-- but-- I woulld lean toward the Video card in this case--I don't see anything else it could be-- something with a faster core clock-- and more video RAM... 256 is not vey much in today's world.

Yes, it will be your graphics card. It is a very slow card. If you want to game well, i recommend one of these (i can personally recommend the Radeon card its amazing)

VisionTek 900203 Radeon HD 3850 256MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Retail

XFX PVT88PYDE4 GeForce 8800GT Extreme 512MB 256-bit GDDR3 PCI Express 2.0 HDCP Ready SLI Supported Video Card - Retail

256 of VRAM is plenty unless you are running ultra high resolutions.