I've been using Avast Pro, but I've been having a problem where it freezes at system startup which is a common thing reading the avast forums. The license expires in a few weeks anyway so thought I'd try Norton as it seems highly rated these days. My firewall is full version Online Armor, that expires in a few months and I also run Malwarebytes paid. Should I go for Norton Internet Security 2011 to be hassle free or the cheaper option of just the AV product? Does it run ok with other security products? Thanks.