Various Threats

I was on ZooChat.com when a threat was detected by Avast Free- avayvxaxc.exe and Win32/Dropper-Gen (Drp). Is this a serious threat?
Also, I was looking up crafts a few weeks ago when a weird message popped up, saying “You have to be over 18 years of age to play this game or something” and another message saying, “Your computer is infected! For security call [phone number}!” and this weird popup. A voice said, “Are you a boy or a girl?” This is an Acer Aspire running Windows 7 Home Premium 64-bit. I think the boy or a girl popup is Wizard101, but I am not sure. What should I do to make sure these threats do not happen again?

Seems your comp may have some crapware/malware

Logs to assist in cleaning malware https://forum.avast.com/index.php?topic=53253.0