You may have experienced receiving a call on the phone, usually from an overseas number. People who speak with English-Indian accent claiming to be from Microsoft and will help you remove the virus on your PC. These are just a bluff. They are looking to get personal information and scam you for money.
If you experience to be called by these simply hang up or not respond initially.
Sometimes these scammers use Norwegian phone number that they are hiding behind.
And if you are called by a foreign number, do not call back. It can cost you thousands.