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Malwarebytes would be a good place to start! Then you could scan with Adwcleaner! I'm a very big fan of Malwarebytes. You can get it here http://filehippo.com/download_malwarebytes_anti_malware/download/fd328691238027e29c42d30ac7ee71ac/Run all kinds of anti-malware software. Malwarebytes, for example.