people are phoning people saying they have been getting lots of error message reports from microsoft and they will help you help you fix the problem if you go to your computer they will help you as you have been infected by a trogan horse one of the worst viruses around.
WHAT EVER YOU DO. DO NOT LET THEM NEAR YOUR COMPUTER THEY ARE HACKERS WANTING TO GET INTO YOUR COMPUTER, they will install the trogan horse and infect your computer. then they will get hold of all your personal information including you bank details. WHATEVER YOU DO DONT TALK TO THEM JUST HANG UP