Sorry, but another "Critical error Jpcsp cannot display" user...

[montcer9012]

It's a good antivirus, but, yes, this is annoying

I disagree. I used to have it until one day a trojan block it, uninstall it and block me from installing another antivirus hahahaha. His protection is very weak against unknow threat.

About the problem it is giving to you, maybe you have other antivirus or secure suit before install Avast; if that is the case, maybe an old config is in conflict between the 2 protection programs. (Even the old one is "uninstalled")