computer virus

all i have on my computer in terms of protection is Avira Anti-Virus. its free to use.
 
It happened to me and when the pop up came up I immediately hit alt-f4 and closed the box, i remember this working but it could have been a different pop up than the one you are referring to.
 
all i have on my computer in terms of protection is Avira Anti-Virus. its free to use.

All the ones I mentioned in my post above are free, Spybot and Hitman Pro (free 1 month trial) have found things on my PC that Aviva and Malwarebytes didn't
 
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