MY PC was stuck with an older version of Media Center and wouldn't even download Media Player 11. Tried hard as I could to trick it into talking with my HR20 but couldn't. Neither box could see the other on my network where they are both hard wired to a common router. I ran Microsoft's Vista Adviser which told me I could run Vista with just a few improvements. I added a Gig of RAM and upgraded to a "Vista Capable" video card. I had to trash my old AntiVirus program and most of my CD/DVD burning programs as Vista refused to install while they were on the PC. The "Upgrade" took nearly 4 hours although 45 minutes or so was wasted because the installer found an old dead hard drive (de-activated in XP) and tried to revive it. That drive had crashed and burned almost a year ago and I'd completely forgotten about it. Once installed the network settings found the HR20. A double click in it's ICON popped up a screen where I could activate media sharing. My point? VISTA home premium upgrade over a Media Center 2004 install DOES play nicely with the HR20. Vista doesn't know how to play with my older Compaq A3000 printer, but I was considering a new one anyway. I bought the Vista Home Premium upgrade at Target and used a 10% card to save $16 off the $159 list price.