Dear All,
I have an ASUS P5GL-MX motherboard with Intel 915GL chipset and was facing the exact same problem. The video playback was jerky, blocky and pixelated. I initially thought it was a problem with some codecs or rendering (Haali, Direct3D etc..) and was messing around with installing codec packs and playing with the settings (all these were suggestions from other forums where this problem had been solved). Nothing worked. After I read this thread, I zeroed in on the issue with getting
drivers for Intel 915 series chipset. The latest updates from the Intel Download Center (for the 915 and Windows 7) did not work as the OS refused to install it.
I looked (only) for some two hours and finally found the solution for this problem. Please click on the link below.
Download Locations
The
driver is only for Windows XP but it works on Windows 7 Ultimate!!! I clicked on 'Run' with absolutely no hope of getting it installed (had already seen multiple popups saying "this operating system is not supported" and was very disheartened this evening). Ok, it did say again "this operating system is not supported". I thought "Yeah, I know. As expected" and clicked on 'OK'. This another popup appeared which gave me an option to run the program with "...recommended settings....". I thought here I go again and I gave it a shot. It installed!!! It worked. After it restarted, I immediately ran to Device Manager and checked "Display adapters" and voila! (Screenshot attached)
I must admit I had sort of given up hope, and started having ideas about buying a PCIe graphics card. I had set a deadline. If I didn't find a solution by 22:00 Hrs, I disconnect the Windows 7 hard disk and reconnect my old IDE HDD with a very stable and reliable Windows XP SP3 and hunt for solutions when I have the time (Yeah right! I'd still have endlessly searched like a madman tonight and everyday, without any deadline whatsoever. That is how I am when it comes to troubleshooting issues with my computer).
I know this post is long. Sorry. I'm too excited!!!!
Hope this helps!

Please try other newer
drivers (if ya'll could find any) and let me know if they work too.
Thanks.