I had the same experience as Lynne, I called after i had a message appear on my computer and froze my browser screen. It tell yous not to open another search screen, not to shutdown your computer because all your information will be lost and then tells you that you have an extremely aggressive virus that is collecting your private information as you speak. If you use your spyware then it will most likely show you have no virus

1800 958 220: Re-routed numbers to a nasty and sophisticated call centre based in India that pretends to be working as or for Microsoft support team.( Apple computers are an easy target). They are FAKE, FAKE, FAKE. Those scums are installing malwares and viruses from popups or with bundles software as Adobe Flash. More important, Adult sites are 98% to be found as their favourite way of passing their viruses . Your internet browser suddenly freeze and your computer is frozen. Best way is to shut your computer down ( by pressing power button for 20 to seconds or to make sure unplug Your computer). Fear and stress will take over with messages saying that your computer has had a virus attack. Restart with a clean browser cache and a run of a antivirus if you have one. Talk to someone (to your local computer guy) if you are not reassured or still in distress.This is a free phone call number, that’s targeting Australian audience. Note that nothing has changed in your computer system but check if some extensions had been added to your browser.If you do a lot of surfing the net, always run Task Manager that can stop any further damage. Do not let those curry scumbags win.( any clues where you did get that popup or blue screen?)
https://discussions.apple.com/docs/DOC-8771

An alert re security problem on my computer. This would seem to be a spam. Think I will go Linux.

I wonder when we can get the actual address of these scammers and if near by, use a drone to tip paint over their cars at night.

A message came up on my computer screen on Tuesday telling me it was from Microsoft. The instruction was to phone this priority number because my computer had been hacked. I phoned and the so called Microsoft technical assistant told me it would cost a total of $450 to fix the problem. After some discussion I decided it was a scam and hung up.