BSOD during playing games

Hi Guys! The BSOD-s started with Battlefield 3. Then I tried every kind of solution which i found online, but nothing worked. Then I recently did a full system refresh, Battlefield crashed again. So I got used to it, and played other games like Trine 2 or Counter Strike Global Offensive. Those games worked just fine, but now they're also crashing. Anything else works fine, older games also...