Here are the system requirements for the game. It seems I'll have to upgrade a few things.
In order to run this game properly, your PC MUST meet or exceed these minimum requirments:
Supported OS: Windows Vista / XP (only)
Processor: 2.4 GHz Intel Pentium 4 or AMD Athlon MP 2400+ (3.5 GHz Pentium 4/AMD Athlon or 2.5 GHz Core 2 Duo/Athlon 64 X2 recommended)
RAM: 1 GB (2 GB recommended)
Video Card: 128 MB DirectX 9.0c–compliant, Shader 3.0–enabled video card (256MB recommended) (see supported list)*
Sound Card: DirectX 9.0c–compliant sound card
DirectX Version: 9.0c (included on disc)
DVD-ROM: 4x DVD-ROM drive
Hard Drive Space: 5 GB
Peripherals Supported: Mouse, keyboard, Windows compliant gamepad or joystick
*Supported Video Cards at Time of Release:
ATI RADEON X1300-1950 /HD 2000 series
NVIDIA GeForce 6600-6800 / 7 / 8 series
Laptop versions of these cards may work but are NOT supported.
These chipsets are the only ones that will run this game.
Source: Ubisoft