Windows is more popular than mac OS and linux in terms of
usage. This makes it a more popular choice based on majority
opinion.
Windows is cost-effective in terms of features provided. The
system cost and hardware cost is lesser than mac OS. Features of
windows are better than linux for a non-programmer.
Almost every software is available and developed first for
windows due to popularity, and there are hardly any softwares for
linux/ mac os that don't run on windows or don't provide needed
functionality.
Customising to improve or change windows desktop hardware like
RAM, motherboard is easier than other systems.