While surfing the net, a threat pop-up came up in size 60 font covering the whole screen. Saying that I have crashed and that my video and sound will not work until I upgrade the media codec. I have tried many adware and malware remover programs. I have AVG antivirus, superantispayware, spybot, spyware doctor, Malwarebutes.
I do not have sound and cannot get video. Can anyone help me.