I've just installed the free home edition of Avast antivirus. It installed fine, save for a conflict with Popfile over email access, which I resolved following the advice on this forum (i.e. alter avast4.ini slightly, and reconfigure Outlook to check for email on port 8110 instead of 110) and I can now access my email without problems.
I can't get Avast to work, however. When I initially installed it, I clicked on the option to test the software for 60 days without registration. I then rebooted as requested, but on loading up avast again it insisted on a registration key, otherwise the program terminated. So much for the 60 day trial! So I registered as requested, and received an email with a registration key. I copy and paste this key into the Avast dialog box, and it informs me that the key is invalid. Repeated attempts still fail.
Any ideas on how to get this program to run? I don't have multiple accounts on this computer, I simply log in as admin all the time, so I don't think it's an account problem.