I have suffered for a long time from my browsers not operating. I tried all solutions but none have worked.
By chance, I clicked the properties of explorer and found out some Chinese options. I understood then that there is a virus.
I went to Firewall settings and found a program in Chinese. It i s QHSafeTray.exe Upon searching in the internet, it was defined as a trojan. I deleted it and everything is now fine with me.
Hope it works with you as well.