Please use the cruise Tag,
And also johny, is a suspicious user because the user use a Tech support instead of a cruise support. Also the "Got pop-up on my PC, forcing me to call its given number" Doesn't he/she know how to restart the computer?
and the "forcing me to call it's given number" Please, if it's forcing you to call the number,
GO get a new PC.
And if it's a overlay causing this? How did you post here? it doesn't make any sense.