Today I find out something not right in my firefox brower, the Tools → Add-ons page was empty and one of the addon I installed: adblock plus didn’t block ads. Then I checked avast tray icon, I surprised to find out the icon status was red, it said my pc was unprotected and the service has stopped. I opened avast main window.
http://i62.tinypic.com/50s2yq.jpg
I clicked “Resolve all”, nothing happened. The service can’t start no matter what. The virus definition status on update window is also unknown.
http://i60.tinypic.com/xnffdc.jpg
I got a bit panicked, so I installed malwarebytes and scanned my pc, only found few PUP.
Then I read some posts here who seems also had similar problem, so I tried to uninistall avast but it hung on this step:
http://i58.tinypic.com/28u37o4.jpg
I even couldn’t cancel it.
After waiting for awhile, I restarted the PC and got another surprise, avast worked as normally. So what really happened here? I thought malware managed to intrude into my pc and disabled avast service.
But anyway I still uninstalled avast and reinstalled with new one.