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#11
No mate there is no specific Giga driver the driver you need is the one Iquoted earlier http://www.geforce.com/driversas (unless I am very wrong) the GPU brands use the NVidia base.
The board ones are here http://www.gigabyte.com/products/product-page.aspx?pid=4150#dl
Just for info I hardly ever used the Gigabyte disk when I built my Sandy Bridge because the drivers for example were so far behind the current ones. I always use the manufacturers site as the Windows feature in my humble opinion is a waste of space.
Plus the disk also has a ton of unwanted crapware that I personally (I don't know about anyone else) I do not need as it screws things up.
Hasve you checked out the temps too yet?? if not do so with Speccy Speccy - Download and it might be worth checking out the PSU as well
PSU - Jump Start
Voltage Rails - Power Supply 101: A Reference Of Specifications (for reference and info) I would be checking the volts on the different leads and this
SLOTCLEANING
Now as for the slots to clean them use astrip of old credit card about 1/2 inch wide nip the corners off one end - preferably round them offhold apiece of thin lint free cloth over the end dab on some form of alcohol - isopropyl alcohol (what we swab the skin with before an injection) is good and GENTLY swipe along the slots.
This can also be done for the GPU slot/s.
You may think this a lot of trouble to go to but it will eliminate some other probabilities even though they may look unrelated.