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Hi Justin_22 I have the same issues as you with beta 3 and windows media player, I have manged to get mine working again, what I did was completely unistall beta 3 then reinstalled it my windows media player still would not start at all.
Try this http://support.microsoft.com/mats/windows_media_player_diagnostic I followed instructions and my windows media starts and everything works again.
I would recommend intalling beta 3 first, I have the same machine as you:) and then follow the link for windows media player
I hope this helps you:)
happy avast user 
I hope avast will look into this issue 