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I would vote for PHP and C++. Later on, you could switch to C#. In my opinion, you, first, need to know what you are going to do and only then choose the programming language accordingly. :halo:

It's not a bad idea, but I would not use encryption in this case. There are other measures to protect sensitive data.

I would choose Kaspersky over Avast. :)

The one that is updated periodically and can protect computers against the latest infections. :)