Never be Taken in by 1-877-466-1985 Security Alert
It is well annoying that you keep running into the Official Support Warning claiming "your computer has been blocked. Error # undefined" and asking you to call 1-877-466-1985. This securiy alert pretending to be from Microsoft or Apple support can't be trusted. Getting this tech scam cutting in your rotation, you should know that your computer has been invaded by something bad. As an adware designed to cause distress and make you behave irrationally, 1-877-466-1985 bogus warning will lock up your screen and cease your attempt to close it via generating productive pop-up loop. It may be also accompanied with a loud noise beeping "Critical Alert" repeatedly, making you fail to do anything normally. Are you going to dial the number provided?
