Hi,
I found the virus names in the warnings report:
VBS:Trojano-436 [Trj]
JS:NoCheat-2
VBS:Malware [Gen]
Win32:Dialer-Y [Trj]
Win32:Trojano-1175 [Trj], 1218, 1268, 1568, 2184
Win32:Trojan-gen. {Other}
Win32:Agent-AH [Trj]
Win32:Adan-062 [Adw]
The latest avast! scan resulted in 0 infected files.
I don't know whether this list is of any use to find out why avast! stopped and closed off each time after its first infection message.