I have installed Avast Business antivirus today & under core shield option it was showing message that Behavior Shield, Web shield & Mail shield are recommended & should be insalled. So I clicked yes on all three. We shield & Mail shield installed & started ok. But Behavior shield is not installing. I keeps showing installing but it has been more than 1 hour. I tried to restarting pc as well but not worked. I tried reinstalling the whole antivirus as well but not worked.