remove "smart virus" on computer?

My Firefox browser got virus saying "Last version for Firefox user , who used firefox user interface installed the following apps too.... " and keep popping up and asking me to click NEXT to install its program. My anti-virus s software Avast could not remove this virus, so I downloaded AVG antivirus software ,and ran it, but the virus popping up changed its words by saying "Last Version for AVG User Interface user......" ,AVG was unable to remove this virus either, what can I can now? I saw cyber friend said delete the virus in it folder, I don't know its name and location, I will appreciate your any help

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