Okay then,
I have changed PSU, tried other ram, did dust cleaning(temps are okay), installed case fan, running with side open and big a$$ table fan directed to it.
PC is still freezing and programs stop responding(random reboots and bsod are gone, it was psu issue).
Things that freeze/crash are CCD, ETS2(all games basically, even weak games), Movie Maker, Premiere Pro, Windows 7
***I added new cpu and gpu in January, that's when this mindf#ck started. Havent reinstalled Windows since 2015, can it be the issue)