Ok your surfing through porntube has proved a bad idea
AVG - or any other A/V program is useless against this new breed
you need to download the following files preferably on another computer after downloaded you need to change their names cf120408.exe and mb120408.exe
These new malware programs have internal blacklists to prevent certain named exe's from running
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boot into safe mode
run
Combofix
after that has completed it's cycle of fixes(do not stop it or run ANY other program until you see it spit out that text file)
then install and run
Malwarebytes run a quick scan to get the rest off, later run full scan
i bet the files it deletes have some \"TSSD\" names or you got busted by smitfraud
ENJOY your sanity afterwards