Can not install drivers for a Gigabyte GTX 980-OC. Help!

[Uros Stemberger]

Hey guys.
I'm getting really stressed right now. The build that i've built a few days ago is giving me a headache. I can not install GPU drivers. I have windows 8.1 installed and if i try to install drivers in "normal" mode it restarts at start, but if i go to safe mode and install them, they "finish" installing, but after restart, it doesn't go to the login screen, but restart the system. If i try to install windows 7, it doesn't let me. It restarts the system before it even gives me options.
I've tested ram with memtest, for 7 hours, 2 passes, no errors.
I tried alot of drivers from the Nvidia site and no difference.

The specs of the computer are:

Asrock x99 Extreme 4 (MB)
i7-5820k 3.3Ghz (CPU)
Corsair H100i (Cooler)
Crucial DDR4 - 4x8gb (RAM)
Gigabyte GTX 980-OC (GPU)
Crucial MX100 SSD 256GB
Seagate SSHD 2000GB ( Not yet formatted )
XFX P1-850B-BEFX 80+ Gold ( PSU )
Corsair CC-9011049-WW Obsidian Series 450D Mid-Tower
BenQ GW2765HT (Display 1440p) Currently using only 1.

Thank you guys, your help will be really appreciated.

 

[Uros Stemberger]

Ok guys... The problem was fault ram. 1 of the rams isn't working as it should. After reseating and testing the ram, running memtest for 7 hours with no showing of any errors, i finnaly found the one. Sorry for the post, but this was going on for more than a day. I came here as the last resort.