I am getting calls on a growing malware scam. Basically, you get a popup which blocks your screen and gives you a number to call. Under no circumstance do you call any number they give you. I have included Microsoft's official post on this topic with a list of spam numbers. These scammers are looking for your credit card information and access to your computer. Take the machine to a qualified technician immediately. Cease all use. If you have to hold the power button down for 5 seconds to kill the computer, do it. Do not turn it back on until after having the system cleared by qualified people.
Please see this site for reference: https://www.microsoft.com/en-us/wdsi/threats/support-scams
Jay C. Theriot