We've had problems with our 2008 servers too, but working on it in a logical manner, and finding support here when needed has helped me (us) get everything working just fine.
Again, I agree with wpn that support should be a little faster/better, but Avast is in no way "garbage" software.
I believe that a lot of the problems will be fixed (pertaining to the new OSes) with the new version 5 that's hopefully coming out soon, and when it does, support here and by phone and email will increase because they won't be concentrating their efforts towards the software, as they are now.
If you want the product to work, and are willing to give it a chance (once running, I'm sure you'll like it better than the other A/V products out there), post your problems and we'll help you out as best as we can.
Just chill and be patient. Not all software works immediately, and that's why it's not good to install anything like this in a production environment first. Once you get the kinks out, then you know what to expect...
Also, once installed, you have 60 days to figure out if it works for you, before purchasing. That way, if you can't get it to work or don't like it, simply uninstall it and find something else. Why did you purchase it before trying it out (if that's what you did)?