Remove Mswtj_xyz Pop-up Alert - Get Rid of 1-855-855-6173 Phone Scam

My pc has froze up. I clicked on a pictures on facebook to enlarge it. Instead it took me to a website mswtj_xyz. it says... This is a .net frame work file missing due to some harmful virus. Debug malware error 895-system 32 exe failure. Please contact microsoft tech to rectify this issue. Please do not open internet browser for your security issue to avoid data corruption on your registry of your operating system. It also says to not shut down or restart my computer, that doing so may lead to data loss and failure of operating system,Hence non bootable situation resulting complete data loss. phone # is 1-855-855-6173. ...... Is this legit? what can I do?? should I shut down my pc??? computer is completely frozen up

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