Installed and rebooted, wouldn't go past the login "welcome" box.
Rebooted and this time I could login, but none of the avast providers/shields/scanners was running.
Restarted the avast service and all the providers started up again.
This is from the Windows event viewer, under the Antivirus section:
Error: 31-03-2007 11:05:15
AAVM - initialization error: AavmStart: avworkInitialize failed, 00000002.
id: 90
Information: 31-03-2007 11:05:15
aswServ::AavmStart ERROR...
id: 90
And this is from Error.log in C:\Program Files\Alwil Software\Avast4\DATA\log
31-03-2007 11:05:15 1175331915 SYSTEM 2104 AAVM - initialization error: AavmStart: avworkInitialize failed, 00000002.
And this is from Warning.log in C:\Program Files\Alwil Software\Avast4\DATA\log
31-03-2007 11:05:15 1175331915 SYSTEM 2104 aswServ::AavmStart ERROR...
Running Windows Vista Buisness Danish.
Don't know if this is a unique case, but there you have it.
*Update*
32 bit btw.