We have tested graphics driver 18.104.22.1689 with XBMC on windows 7 64-bit professional and we have not found issues about it.
I recommend you testing the latest drivers of the HTPC manufacturer, usually these drivers have been customized according the system specifications, instead Intel(R) drivers are generic.
Thank you for your reply!
Unfortunately I built the HTPC myself so there's really no custom drivers from the manufacturer.
I built it using the following:
CPU - i5 2400
RAM- 4GB Corsair Modules
Motherboard - Asus PH67-M PRO
SSD - OCZ Vertex 2 60gb
The latest drivers on the asus support site are the 22.214.171.1249 generic intel drivers. I'm having some trouble reverting to them. When I try I'm suddenly getting single digit fps on some movies while others play fine. I'm guessing it has to do with the newer drivers still mucking things up somehow. Anybody have any ideas about how I can clean them from my system?
I did some further troubleshooting and found a workaround. If I manually set the refresh rate in windows to 24hz I get smooth playback.
Also there's no delay between picture and sound like there was when I had the refresh rate set to 50hz. I figured out that the delay was from xbmc changing the refresh rate. I had the option to synch refresh rate to video enable to avoid judder. If I disabled that the delay went away.
The workaround is not really optimal but since I only use the htpc for movies it's not such a big deal atm. Won't really work if I ever want to do any light gaming on it though. NES emulators and such.