Hi Justin, great to know that it's working fine on your system... so it's not that avast! blocks it in any way. Ugh, I just remembered I had it installed with Quicktime some time ago... and I've never had any problems with it. It's just I hated it because it took all those media file associations without even asking me first. What was even more annoying, there was no chance to find and change those file associations inside some settings/configurations page... so I uninstalled it, but I remember it was working fine.
I bet (99% I'm sure) what's blocking itunes on laureljeana's computer is a firewall, not avast! because avast! do not block programs, avast! is not an firewall, avast! is just an antivirus.
Also, feedback from laureljeana would be greatly appreciated.
Please answer those questions we asked up there, even if you solved your problem it would be nice to let us know so it can help some other people potentially experiencing same problems...
Cheers !