Windows 10 is going to be released on July 29th, but one feature that many cordcutters will be missing is Windows Media Center.
I am still happily running Windows 7 on all my PCs at home (I can’t stand the Windows 8 interface), so I was not planning on updating anytime soon. Microsoft supported Windows XP from 2001 release up until 2014, so I don’t see Windows 7 (released 2009) going away anytime soon. At this point, my only action will be to keep my OS from auto-updating to Windows 10.
However, if and when the time comes, it should be easy enough to move to a new DVR software. There are several pretty good alternatives out there. My favorite is MediaPortal which is free, and can run on the same exact same hardware that I already built.