You probably need to tweak the optimization and update scheduling within WMC.
With recording location and other things configured, I've made several recordings with it in Win 10.
Biggest problem with all of this is the knitting together of your hardware with the ability to play what's recorded on it. Sooner or later, the basic guts of my 2600K system will be replaced by a Skylake, and I'll lose the ability to replay recorded encrypted channels. Of course, the OTA and unencrypted cable channels should still be good for replay on the replacement system.