You could mention some other antivirus that REALLY looks professional… something like BitDefender or even Norton 2005 like RejZor mentioned. AVG has most silliest interface ever seen. Those colors are just like you are running your system in SAFE MODE, IMHO totally unprofessional. Not quite good example.
If these look unprofessional, then I don’t know what are you looking for:
http://img220.echo.cx/img220/5098/previewcorporate1tl.jpg
http://img217.echo.cx/img217/6697/previewliteon0zc.jpg
http://img214.echo.cx/img214/9336/previewrejzorsharp6pi.jpg
http://img212.echo.cx/img212/438/previewszckde3by.jpg
http://img211.echo.cx/img211/884/previewflatnsimple2yo.jpg
Although, Alwil could do something regarding choice of avast! defaul GUI. The fact and most important thing is… no one should choose antivirus product by it’s look. If the most important thing to you regarding one antivirus is how it looks, than I don’t think you pay full attention to your computer security. The thing is, we didn’t make this antivirus looks ugly or worse, we gave people the choice to change that look… actually, we gave them many choices, so no one should complain. There are all kind of skins, so something for everyone.
Bottom line, if you don’t like skins (that’s your right), you can always buy Professional version of avast! and you’ll have plain Windows look with ENHANCED USER INTERFACE. See here:
http://img134.echo.cx/img134/2066/eui3vm.jpg
Also, there is an option to disable skins, so I don’t really see the reason to abandon avast! just because of skins. See here (Skinless Simple User Interface):
http://img160.echo.cx/img160/1879/sui7qa.jpg
…but telling that this is professional look… hmmm… I don’t know…
http://www.ballangen.net/images/avg.jpg