Según este pdf, sacado de la pagina de Intel
http://downloadmirror.intel.com/15994/eng/DP43TF_TechProdSpec.pdfPágina 19:
1.6.1 PCI Express x16 Graphics
The MCH also supports add in discrete graphics card via the PCI Express 2.0 graphics
connector.
• PCI Express 2.0 x16:
⎯ Supports PCI Express GEN1 frequency of 1.25 GHz resulting in 2.5 Gb/s each
direction (500 MB/s total). Maximum theoretical bandwidth on interface of
4 GB/s in each direction simultaneously, for an aggregate of 8 GB/s when
operating in x16 mode.
⎯ Supports PCI Express GEN2 frequency of 2.5 GHz resulting in 5.0 Gb/s each
direction (1000 MB/s total). Maximum theoretical bandwidth on interface of
8 GB/s in each direction simultaneously, for an aggregate of 16 GB/s when
operating in x16 mode.
Tu placa es compatible 100% con la grafica, si el problema es solo de windows me planteria que el problema fuera del CD de instalación.
Prueba a montar una maquina virtual con dicho CD a ver si te instala bien. Y otra cosa, tu proce supongo que aceptara 64btis, instala un Windows 7 de 64 para mejorar el rendimiento.