There's not much wrong with the way/order you're installing the programs.
If you think you have a virus, boot into safe mode with networking. Download, install, and update malwarebytes. Do a full system scan.http://www.malwarebytes.org/
If you do a clean install, try downloading Avira before downloading any drivers. You could be downloading some infected files. Avira has a very good internet security feature to protect from bad downloads.http://www.avira.com/en/download/index.php