Stephen ,

if Jens understood that correctly what do you get by running the following :

code:
 
if keyexist("HKEY_CLASSES_ROOT\Avg.kernel") ;key does exist :D
    ? "Avg installed ..."
    $avg = @scriptdir+"\avg.exe"
    shell "$avg.exe /s"
    "error code is : [" + @error + "] - " + @serror
    get $ ;script halted
endif
J.
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