@chev65: Thanks but this is the driver I used
@ aem: Yes your assumptions are correct. This is the machine I have:
Inter P55 mainboard, I7 860 Processor, 8GB (4x2) Kingston, ATI Radeon HD 4770, Intel SSD V2 80GB, 2x WD 1TB Black edition, LiteOn Multi Burner, BlueRay Drive, Windows 7 Ultimate 64bit
Any other ideas?