Assassin's Creed

In order to play this game properly, your PC MUST meet or exceed these minimum requirements:

Supported OS: Windows XP / Vista (only)
Processor: Dual core processor 2.6 GHz Intel Pentium D or AMD Athlon 64 X2 3800+ (Intel Core 2 Duo 2.2 GHz or AMD Athlon 64 X2 4400+ or better recommended)
RAM: 1 GB Windows XP / 2 GB Windows Vista
Video Card: 256 MB DirectX 10.0compliant video card or DirectX 9.0compliant card with Shader Model 3.0 or higher (see supported list)*
Sound Card: DirectX 9.0 or 10.0 compliant sound card (5.1 sound card recommended)
DirectX Version: DirectX 10.0 libraries (included on disc)
DVD-ROM: DVD-ROM dual-layer drive
Hard Drive Space: 8 GB
Peripherals Supported: Keyboard, mouse, optional controller (Xbox 360 Controller for Windows recommended)

*Supported Video Cards at Time of Release:
ATI RADEON X1600* / 1650*-1950 / HD 2000 / 3000 series
NVIDIA GeForce 6800* / 7 / 8 / 9 series
*PCI Express only supported

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These are the specs per Ubisoft's website. I've played it on Windows 7 and it works.

here's my specs not that great but it gets the job done:
CPU Type DualCore AMD Athlon 7750, 2700 MHz (13.5 x 200)
Video AdapterATI Radeon HD 3300 Graphics (700 MB)
motherboard hybrid crossfire
ram 4gb
hard drive 232gb
Optical Drive SONY DVD RW DRU-860S
audio adapter AMD RS780(M) Chipset - High Definition Audio Controller PCI

If you play with the specs that came with your comp it will go super slow...i have it and the game works, but its a low framerate and slow scenes