Funny thing is - I only have issues when wife is watching. She says I spend too much time on this stuff. Then I tell her it's a hobby and come look at how great HTPC is and what this thing can do. That's when soemthing goes wrong. If she's not looking the system works flawlessly.
LOL! This exactly happened to me a few weeks ago. I had everything tuned up, with as little frame drops in MadVR as I could possibly get, everything working perfectly, UNTIL I sat down with the other half to watch a movie. Lo and behold, mega stuttering as soon as the movie starts to get going! Sometimes so much stuttering that MadVR or MC completely crashed needing a task manager sortout! Boy was I in trouble!
I was a bit lost as to the cause at first, and why it would *only* happen with the other half watching too. I figured out that if I twiddled the mouse as soon as it started to stutter that it would be OK for a while again, but start to stutter badly a while later again. I figured it out to be the Norton antivirus 'idle time' stuff. Now why it thinks it is idle time when a movie is playing and even the screensaver isn't coming on I do not know. It seems it senses its own interrupts rather than the windows ones. It is just a pain in the a$$.
I now have the idle time delay on max ( only 1/2 hour unfortunately). But turn on 'silent mode' whenever I watch a movie. That seems to have sorted it.
As to why it only happened with the other half watching? Well, I figured out that I fiddle so much with the settings and the mouse when I'm watching stuff on my own that the idle time stuff never kicked in! A sure way to prevent this would be for Matt to program in an inert key press into the keyboard buffer (eg. Alt or Shift) every 9.5 minutes whilst playing a movie! I don't think it will happen somehow!
Sorry, I seem to have droned on a while. Hope you figure out why it's happening for you and your wife!
Cheers,
SBR
Edit: note that the system resource use was minimal in task manager when it stuttered, so it wasn't a CPU problem. I reckon that the Norton stuff just had so much random disc access that it caused the movie to stutter.
Edit2: fixed idle time problems with Norton by adding Media Center 16.exe to the list of programs in the Norton settings for disabling idle time