Remember, never give access to your computer, to your bank account. Make THEM verify your information to YOU. Do not go to any website that they tell you. If you have troubles with your computer, take it to a reputable business in person, or a person you trust.
Do not trust anyone who calls you out of the blue. It's different if you requested help, but if you get a pop-up virus on your browser, exit the web page. Do not download anything from the internet or click 'yes' to pop-ups.
While this number might go to Microsoft if you call it, spoofers can mask what number they are calling from and are untraceable.