It seems to me that when I frequent porn sites, MY COMPUTER BECOMES INFECTED!

But when I don't, my computer works just fine! Three times I have had to have my hard drive professionally repaired... I think they had to uninstall then re-install my windows or operating system or something like that.

My question is, what can I do to protect my computer while visiting porn sites? I download the anti-virus called Avira... and Avast but those don't seem to help!