1800 661 980 is a nasty call centre based in India that pretends to be working as or for Microsoft support team. They are fake, fake, fake. Those scums are installing malvares and viruses from popups or with bundles software as Adobe Flash. Your internet browser suddenly freeze and your all computer is frozen. Best way is to shut your computer down ( by pressing power button for 20 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 if you are not reassured or still in distress.