Microsoft just announced that Windows 10 will be available as a download for current Windows 7 and Windows 8 on July 29. For details, see http://blogs.windows.com/bloggingwindows/2015/06/01/hello-world-windows-10-available-on-july-29/
You can already make a reservation, meaning you'll get a mail on July 29 to help you remember to download it.
Help, my PC with Windows 10 won't shut down properly
Since upgrading to Windows 10 my computer won't shut down properly. I use the menu button shutdown and the screen goes blank, but the system does not fully shut down. The only way to get it to shut down is to hold the physical power button down till it shuts down. Any suggestions?