Suddenly, it started to fly out of almost all games. Help advice)

Cleaned the computer, struggled with lags, checked for viruses with free kaspersky software, avz. After these manipulations, after several seconds of activity, either in GTA5 (persons) the subbrocess.exe error, bf4 (persons) without errors, the Witcher 3 / without errors take off. I reinstalled the games, all sorts of socialclub and origin too.
I'll try to reinstall the firewood, but any software. What else can be done? How to find out what is the problem?
PS Dota2 CSGO work fine.