Remove Videoson.lineco/alert.html Pop-up - Get Rid of 1-800-601-3497 Phone Scam

Is this a SCAM? While researching YOUTUBE instructional videos on making a mini bow I received a notice from which I was unable to leave until I pressed control-alt-delete. I looked at the address of the site and it read as follows, videoson.lineco/alert.html. I couldn't release from the website but was able to check my virus protection service which said that my computer was okay and protected. I finally was able to free myself by hitting Cont-alt-delete. Any information regarding this is greatly appreciated.

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