i installed windows 10 on last weekend but the experience so far is not encouraging.
The bootcamp installation procedure did not ask me for a usb key (though i had it available). I did not activate windows, as it is not required according e.g. to this site
http://www.windowscentral.com/you-do-not-need-activate-windows-10.
Apparently everything went well, devices were immediately working. At the beginning i did not install external software and for the first two days everything seemed to work. Then i installed dropbox and firefox and when reproducing some video in streaming i had errors like 'the amd driver crashed, it has been restarted'. I then removed firefox and installed chrome, and again everything seemed to work correctly for some hour. Anyway, at a certain moment i tried to shut down the computer and the screen was deactivated but the mac did not shut off, i had to shut off by the physical button. The morning after the computer rebooted itself (while i was using the mac, but not on my request) many times, one time the reboot was preceded by a loud noise produced by the mac, and there was a red light in the bottom of the mac. I had many times the problem with shutdown that deactivates the dispaly but doesn't complete the operation.
Then yesterday i was able to systematically throw the self reboot. It was enough to watch a video on youtube with chrome and meanwhile open a file in the dropbox, edit it and save it. When i did this the reboot was triggered in a few seconds (with noise and bottom red light).
This morning i reinstalled windows and for now i have not installed any other software. One question is: after having those type of problems with windows (self reboots, restarts of graphic driver and similar), does it make sense to do a reset of SMC and/or reset of NVRAM? Do these operations apply also to windows or only to mac os? What are reasonable reset operation to perform with windows?
Another question is: what are the meanings of the noise and of that bottom red light?