Avira has one of the best Real-world protection of free products.
I would recommend to use Avira with Malawarebyts and EMET. Perhaps the best combo u can have for free.
It might be problem aswell, under full load ur system will need moar then psu can give.
You can easily calculate it with http://extreme.outervision.com/PSUEngine , it gives pretty exact result
Can you run http://sourceforge.net/projects/hjt/ and report log
ps. when ever you borrow ur pc or let some1 else use use ur pc, create new account with limited rights
Since when you set the Textures under display options to medium didnt seems to work, have you checked if there is update for your Microsoft .NET Framework as well as your Visual C++ Redistributable for Visual Studio 2012. Have you tried to re-register dll by using Regsvr32 for %d in (*.dll) do...
memory support: http://www.asrock.com/mb/AMD/970%20Pro3%20R2.0/?cat=Memory
from romania http://www.dc-shop.ro/cauta/KHX1600C9D3K2/1/1 or http://pc-coolers.ro/cautare/KHX1600C9D3K2?s=KHX1600C9D3K2