Terrible Lag

I've been experiencing terrible lag while playing Poker Night at the Inventory. I have the resolution set to 800 x 600, no effects on, windowed mode on, graphics quality on lowest, shadow quality off, and anti-aliasing off, but none of that seems to improve anything. Here's my specifications:

Operating System:
MS Windows XP Professional 32-bit SP3

CPU:
Intel Pentium 4 650
Prescott 90nm Technology

RAM:
2.00 GB Dual-Channel DDR2 @ 265MHz (4-4-4-11)

Motherboard:
Hewlett-Packard 09E8h (XU1 PROCESSOR)

Graphics:
Default Monitor (1024x768@60Hz)
64MB Quadro NVS 55/280 PCI (nVidia)

Hard Drives:
156GB MDT MD1600JS-00NCB1 (SATA)

Optical Drives:
HL-DT-ST CD-ROM GCR-8486B

Audio:
SoundMAX Integrated Digital Audio

I doubt there's much that can be done, except for me getting a better/upgrading my computer. However, I'm hoping someone may be able to help.
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