Avast is installed again! Just reboot the PC

I cannot unibstall Avast. I used Clear utility, but next morning after turning on the PC it is installed again! I used uninstall utility and cleared scheduled tasks in Task Manager. It doesn’t help too.
This antivirus is worse than virus! I don’t want to use this software! >:( How can I rid off it? Who knows, help me please!
P.S.: OS Windows 7

what avast version and build number? right click avast tray icon and select “about”

is this a business computer?

17.3.2290

Yes, it is on my work

Could it be that avast is distributed/reinstalled from your work admin consol ?

If so i think you need to remove it from The admin console first