New build keeps giving me issues

I re-installed windows 7 because I was getting the "display driver has failed and recovered" and did not bother insalling the drivers for the HD 5770 and it stopped giving me the error. before I did everything else it was freezing and crashing on me with 4 gigs of ram installed, but it seems to work fine now with only 2 gigs in the slot. The sticks I have are the corsair xms3 DDr3 at 1600Mhz 4GB (2x2GB) 9-9-9-24 1.65v ver 2.3. The Mobo is a GA-MA785GT-UD3H with AMD Phenom II X4 955 Black Edition Quad Core Processor 3.2GHZ AM3 8MB Cache 125W and Corsair 650W PSU.

Download memtest and test each stick for problems, especially the one you took out.

Probably not, but you can look into it as well. I would suggest you try the following:

1) Try each and every memory slot with the bad stick of memory only, and see if it still crashes and whatnot.

2) If it does, check your BIOS to see how much voltage the sticks are getting. They should be getting 1.65V. You can find it by going into 'OC Tweaker' to 'Memory Configuration' under 'DRAM voltage'

3) Try running both memory sticks at 1333Mhz instead. You can do this in the BIOS as well, when you go into 'OC Tweaker' to 'Memory Configuration' under 'Memory Clock.'

If all that still crashes, then yes, your memory is faulty. The reason I'm giving you so many alternatives is that the RMA process can be long, so you'll want to avoid that if possible.

I would suggest trying to RMA them first. They are under warranty, so you shouldn't run into any problems with Corsair's support. Here's the link and the instructions (scroll down until you get to 'Request a Return Material Authorization Number (RMA#)')