WMC is dead. Support ended years ago IIRC. I don't know why you'd need to use it anymore.
Why? He spelled that out completely (and I have... I think it was in another thread on a related topic in the Video Cards forum... and many times before I'm sure). There is no alternative. Without WMC, one cannot record protected content from a cable company. I use an HD HomeRun Prime, and while many apps can access a fair portion of the available content in the cable subscription, much of the content is protected by a copy-once flag. This stuff can, unfortunately, only be recorded by WMC. And worse, that recorded content cannot even be shared with any other device on the network. I had an app that accessed recorded content to stream wherever I was in the world, set up a dynamic DNS service for it and everything, but only non-protected content was available to stream. Even with two PCs on the network, both having WMC, they couldn't access protected content on the other machine. The only way to access protected recorded content on the network is with a WMC Extender, and there remains only a single third-party extender, which will not work on Windows 8. The only other device is the Xbox 360. Not even the Xbox One will do this.
We users who love and enjoy this feature, are pretty much screwed. Granted, we're in a period of time where, eventually, the CableLabs consortium will get behind new specifications, and hopefully the FCC/FTC will enforce compatibility to a further extent than before. That said, this is an in-between period, and it may take a decade if not longer for any new technology to actually trickle down into the market. I have a fear we CableCARD consumers will be screwed until any new technology is fully ratified and available. Nobody else seems to be taking up the effort for protected CableCARD content - last I heard, the licensing and whatnot is insanely expensive, unless you're a behemoth of a company. This saddens me, because I seriously, seriously do not want to deal with the shit that our local cable company calls cable equipment. Seriously, fuck Arris equipment. And I want the freedom and opportunity to do everything media related I want on one machine: Live, Recorded, Streaming, Nefarious sources, perhaps some streamed gaming through Steam, some console emulators, and ultimately, whatever the hell I want. That's a dream machine right there. Granted, due to power consumption and, for the moment, simply a better user experience, all my streaming would go through a Roku. The Netflix Windows 8 app is decent, but really, that's the only one available. I don't really care to deal with the browser-based solutions, as most of the time, they don't work well with universal remotes, and they usually don't offer the highest image and sound quality. It's stupid easy on a Roku or other streaming box, and it all works well with a universal remote. Plus the Roku uses basically no energy, I think it's around 5W during active streaming? Get the HTPC to sleep when not recording or otherwise in use, and bam, you seriously save a good chunk on your bills, especially when you factor in that a cable box and the associated fees are also not on your bill, which usually draw power constantly and add even more to the cost. Really, it still comes down to having an awesome box you control, or a shittastic cable box that crashes or wigs out more than half the time.