If Microsoft counts half the world's population as using Windows then ...
7,632,819,325 / 2 = 3,816,409,663 x 0.0001 or 381,641 people having said issue, which for comparison is about the population of the city of Tampa, Florida.
If they can be as precise as 1 hundredth of 1 percent then why not just give the actual number that they reported as having the issue?
Else you have people on tech sites estimating their actual total with hopefully wrong variables.