For a new o.s., a clean install is a must. When you're using Anytime Upgrade it's unneccesary, as you're only unlocking feature's in the higher up version. It's still the same version of Windows, just with feature's you didn't have access to before. Either way, I changed my mind and got the blu-ray burner and PowerDVD 12 Ultra for the burner and any mobile devices I may get. The PowerDVD 12 Ultra is quite like Media Center, with 2 exceptions. No Internet TV or TV in general. My tv tuner has software for it that solves that issue and PlayOn which I have on my pc for streaming intnet to my Xbox 360 solves the internet tv issue and then some. I've had Hulu & Youtube for a year befor Microsoft put them in the Xbox Metro update back in January. There are also, numerous scripts and plugins available for PlsyOn. Only problem is that you need a game console to use it, even though it get's installed on your pc. I have a funny feeling that Microsoft is going to rip off people getting WMC in Windows 8. They've stated that it's going to be a addon for only Windows 8 Pro & Enterprize. It won't be available in regular Windows 8 or Windows RT (tablets/ARM0. I smell a $120.+ Anytime Upgrade to get it. I just covered myself on all fronts for that one this morning. The PowerDVD is already on my pc and the burner get's here Monday or Tuesday.