Thanks for your post. I never got a chance to overclock the pc. I did what you said and ran the memtest but the computer froze after 30%. Scan disk brought up no errors and the problem persisted!
In the end i got sick of it and i wiped the the system and reinstalled Windows 7 and the drivers again. this time i made a system image between installing the major drivers in case i ran into the same problem.
Fortunately iv been running the pc all day now and it hasn't frozen so it looks as if the problem has been solved.
I decided to run prime95 and memtest to double check.
Prime95 came up with no errors
memtest came up with 1 error: Attachment 44331
Im not sure what i can do about this. the system appears to be stable but il probably run into big problems when i decide to overclock.
The following is my system spec, iv installed all the latest drivers with it.
Intel® Core™ I7-975 Extreme Edition 3.33GHz 8MB
Asus P6T-DELUXE-V2 Motherboard
Club3D Radeon HD 4870 X2 Dual GPU
NEW COOLERMASTER COSMOS 1000 PC COMPUTER TOWER CASE
Corsair Dominator DHX+ DDR3 1866MHz 6GB
Cooler Master Real Power M850W PSU
WD VelociRaptor® 300GB SATA
Samsung SpinPoint F1 1TB SATA2
Noctua NH-U12P SE1366 CPU Cooler
LG DVD±RW burner, CH08LS10
D-Link DWA-547 Rangebooster N 650 PCI/Desktop Adaptor
Logitech Dinovo Edge Bluetooth Wireless Keyboard
Trust - Wireless Laser Mouse - Carbon edition
Thanks for your help mate.