My computer is running Windows 7 Ultimate operating system and I am using Avast 5 with it. The problem is that the upgrade to Avast 5 is not working. Everything was working fine in the previous operating system, that is Windows Vista. I have done the upgradation recently. This is a very good antivirus, that I am using from quite a long time. So, please help me with the solutions to solve this issue.
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