Last weekend I clicked on a link in a review to see a profile on another site. Immediately a number of pop-up windows opened and they said my computer had been taken over and gave me number to call and pay the "ransom" to get access to my files. I immediately shut down my computer and ran a full scan. Several "nasties" were found and cleaned. I still have access to my files and it doesn't appear my computer has been compromised. Am I safe or is something more I should do? I also backup to an external hard drive and a cloud site. I've disabled these after the warning. Is it safe to do another backup?