I thought I had resolved the issue when I built a new DIY Server, and upgraded the HTPC to Windows 7, alas the same issue.

About an hour into a movie, Media Center just freezes. Sometimes it will kick out to the main screen, and others it just sits there at the frozen screen, and I have to manually back it out. I have no idea why it's doing this. The other PCs on the network don't do this, whether running W7, or Vista. It's very distracting when you're engrossed in a movie.
The other thing is, if we watch a movie right after that, all will be fine. It seem that it only does it on the first movie when turning on the system.
I have the screen saver turned off.
I have a DIY server running WHS PP3, connected to a GS105NA switch, and wired to a HTPC running Windows 7, connected to an Onkyo SR605 receiver optically, and a Panasonic HC1500 projector over HDMI.

I'd really like to figure this thing out, cause the wife is starting to lose interest in having a HTPC if it's gonna freeze up like this.
Any help appreciated!!

Sean

 BUMP!

Anyone with an idea?!

 Bad RAM and/or overheating would be my first guess.

 The RAM seems to check out OK.

I can't imagine it was overheating, if after that initial freeze at the one hour mark, it will continue to work flawlessly for the next 4 hours.

 The other thing it could be is the NIC and/or NIC drivers.  If you are saying it only happens on that one PC you are likely going to be looking for one or more of those things I posted.