Miért nem indul el a Left 4 dead 1? Mi a hiba?

Mert ez a Left 4 Dead 1 gépigénye:

CPU: 3.0GHz P4, Dual Core 2.0 or AMD64X2 (or higher)

RAM: 1 GB for XP / 2 GB for Vista

VGA: DirectX 9 compatible video card (Video card must be 256 MB or more and should be a DirectX 9 compatible with support for pixel shader 2.0)

DX: DirectX 9.0c

OS: Windows Vista, XP, 2000

[link]

HDD: At least 7.5 GB of free space

Hang: DirectX 9.0c compatible sound card

ODD: DVD-ROM Drive

Az én gépem pedig: AMD Athlon 64 X2 DualCore 2,9 GHz

4GB DDR2 RAM

Nvidia Geforce 8400GS 1GB VGA.