Hmm...... did you install the VIA 4-in-1 drivers? It might help. Thing with SS7 motherboards is video card problems. So they came up with patches/revised drivers to be able to fix this problem. You should try installing the VIA drivers first and then install the one for the video card. Quite weird though this problem you're having coz' the problem with SS7 mobos is usually with AGP. Anyways, do try my suggestion coz' it might work.
Core 2 Quad Q9550, ASUS P5QL PRO, 8GB PC2-6400, 120GB SSD, 2x1TB SATA, GeForce GTX 260 SP216
Core 2 Duo E8500, ASUS P5Q SE2, 8GB PC2-8500, 2x1TB SATA, GeForce GTX 275
Core 2 Duo E7500, MSI G41M-P28, 4GB PC3-10600, 500GB SATA, GeForce GTX 650
Pentium E6600, MSI P35 Platinum, 6GB PC2-6400, 500GB SATA, GeForce 8800GT
P4 650, ASUS P5GD1 PRO, 4GB DC PC3200, 2 x 300GB SATA, GeForce 9500GT