Told me they were from Dell (I own a Dell computer) and that my computer was sending them pop-ups and they wanted to help me fix my machine. I started asking questions and things went awry from there. When I asked for the person's name so that I could follow up, caller became quite rude, asking if I wanted to fix my computer or not and then hung up
The only persons who should be touching your computer is you, your manufacturer, Real Windows support that you have called and/or maybe a real live tech you see face to face! And be very very leery of numbers when you look to call the real ones, there are fake websites up. Never call numbers from pop ups either, thats scareware.