|I would recommend for you to use a smaller hard drive (500GB - 1TB) or ssd (120GB - 240GB) for a boot drive (OS + programs) and use your large drive for a storage drive. There are many advantages to this set up normally and those are more significant when you are using a very large drive.|
If the latest driver is not working with your set up, start it in Safe Mode and roll back the driver to the previous version of the driver. Some times a driver is released to fix a problem or improve performance but in some instances a minor flaw makes it through testing that effects some systems only, so there may be a newer update in a week or so that will fix the newly created problem.
Your power supply appears to be sold mainly in eastern European countries and the best specs I could find were in Russian. It appears that your power supply has two 12vold rails totaling 26Amps. This is not the best set up for your system. It might work decently but if these problems continue or if you get problems when your graphics usage is only at its peak usage or after gaming for a while, the problem will be traceable back to your power supply. If you can swing it, replace it now, if not then keep these things in mind and replace it as soon as you can. If it is a cheap power supply then it is likely rated higher than it can maintain over the long run (peak rating) and may fail prematurely. This failure is sometimes nasty in that it takes other expensive hardware out with it. If it came with a case you purchased, get it out of there even sooner. These are often power supplies that cannot sell by themselves in the marketplace and may have collected a bad reputation (I have not looked though) due to problems.
You have to be a little bit crazy to keep you from going insane.