Here is what appears on the screen when it will go no further:-
Scan of all local drives
Report file: D:\Program Files\Avast4\DATA\report\aswBoot.txt
File C:\Documents and settings\Owner\Local settings\Temp\adlinstallwin32.exe is infected by win32:Trojan-gen. (other)
1-Delete, 2-Delet all, 3-Move, 4-Move all, 5-Repair, 6-Repair all, 7-Ignore, 8-Ignore all, Esc-Exit:
I I choose any number or press any key there simply appears a ? on the screen