Is Wireless Good or Bad in Windows Environment, Especially in Windows 7 Environemnt

It depends on how the deployment has been setup.

I do not think it has to do much with the Windows OS completely though.

Also a thumb rule, if you have 5 Ghz capability in your computer, the chances of you facing any issue with the computer when it comes to connectivity with the AP go less.

is very good and will suports any os but the system want good