In my previous thread about stuttering audio while playing BD videos, someone told me that it was because I have a single core processor. Pentium M 780 2.26GHz.
http://computing.net/hardware/wwwbo...
But my CPU never even reaches the 100% mark during the movie. I've been watching Task Manager, and it goes from 88-98%. It's at 94% most of the time. The picture is smooth most of the time. It does't seem to be skiping frames. Only the audio sometimes stutters really badly.

Is it really my CPU that's causing this? It just doesn't make sense, since a restart can fix the problem! But I really want to fix this, it's so dang annoying!

It sounds more like a memory problem.

More ram! Try shutting down a few running apps and see if that helps.

I already have 2GB of RAM, and the only app that I run during the movie is PowerDVD Ultra.

"...the only app that I run during the movie is PowerDVD Ultra"

Hit Ctrl-Alt-Del, click on the Processes tab, then click on the column heading "User Name"...that will arrange the processes by the username. What processes are affiliated with "Derek111" or whatever username you have listed? The only ones you absolutely need running are Taskmgr.exe & Explorer.exe & of course, PowerDVD.

Definitely check running processes to see cpu and memory usage of PowerDVD. Also possibility of trying a better multi format player. Iv played movies via VLC player on pentium 4's with 1gb of ram and run smoothly :) Also maybe your graphics chip isn't the best?
02coled

C2D-E6600ES-8x425-@3.4ghz
1:1 Ram : CPU
2gb Elipedia @ 850mhz
EVGA 680i
BFG8800GTS-OC 320mb @630-2010
680w Thermaltake Purepower
2 x 250gb Sata2
Vista Home Premium32

Let me clarify what I said in your original thread.

Blu-Ray (especially discs encoded in H.264 format) are very hard to decode, especially if the video card doesn't help out. Your X1950Pro may provide a little bit of help (in the form of motion compensation and perhaps iDCT), but it's leaving the actual decoding of the video stream to the CPU.

While a fast single core may be able to play older BDs/HD-DVDs encoded with MPEG-2 video, the newer VC-1- and H.264-encoded discs require a lot more computing power and is best left to a dual-core CPU or a video card with a unified video decoder (UVD) to handle.

Your CPU usage is pretty high--it should be obvious that a maxed CPU is causing the problems that you're experiencing.

Things to check:
-Make sure that you have the latest version of PowerDVD Ultra installed. This is important. A few of the first HD-supporting versions had compatibility issues with some H.264-encoded titles (I had trouble with Babel on HD-DVD until I updated to a newer revision). The newer revisions are far less...bitchy. :P
-Make sure that the "Video acceleration" option in P-DVD Ultra is enabled. This will offload motion compensation and iDCT to the video card. Every little bit counts!
-Disable Power DVD's video-improving settings, such as CLEV.
-Make sure that DMA is enabled on your optical drive. It's pretty unlikely that it's disabled, since NT-based OSs like XP have them enabled by default. Still, it's worth a check.
-Like others have suggested, make sure that you have no unnecessary tasks running in the background during playback.

Ultimate 939 system
Opty 185 @ 3.2GHz 1.45v
SLI 8800GTS 640MB, BIOS-flashed to 625/1458/1950
4GB OCZ DDR400
LG HD-DVD/Blu-Ray combo
A8N32-SLI Deluxe
13.9K 3DMark06; 55K '01

Thanks, jackbomb. I disabled CLEV-2, which somewhat helped, but I'm still getting the stutterind audio. I looked up my motherboard, and it doesn't support dual core CPUs, only Pentium M's. My board will let me overclock, and I've heard that the Pentium Ms are good overclockers. Would overclocking to around 2.6-2.8GHz allow it to play h264?

NO! sadly not

Core2DuoE6600ES @3.6ghz
2gb Elipedia 1066mhz5,5,5,15
EVGA 680i
BFG 8800 GTS-OC 320mb
680w Thermaltake Purepower
2 x 250gb Sata
Vista Home Premium