I'm not exactly sure what you're asking. I looked at two CD's and they have several files with different extensions. A few are PCX, D32, HEO, HE2, HE3, HE4, W32, DLL, MMS, EXE.
My computer is new so I have the preinstalled McAfee Security Suite. I did test with McAfee turned off but as long as Network and Standard were both on, the computer still locked up. I'm willing to test again, though, if you have a specific recommendaton.
You said:
"Set an avast password to prevent this... (right click de 'a' blue icon and enable a password)"
I'm not trying to stop them from doing this. This is what they had to do to play the games without the computer locking up.