Hd DVD Playback at 10mbps ?????

[dhpointer]

A weird one.

I have a X600 and an NV+ 1 gb. I have backed up my Hd DVDs onto the NV+. I am using Windows Vista and PowerDVD on my HTPC. I have a CAT5E 100mb network via a switch.

What I can do.

I can play HD DVDs on the HTPC using the XBox drive, no problems.
I can play a HD DVD through my network from another PC, no problems.
I can play DVDs from the NV+. No problems
I can not play HD DVDs from the NV+.

On investigation and using Vista's resource monitor I have found the following.

DVD's from the NV+, network is at 100mbs and plays fine.

HD DVD's through the network from another PC uses about 25mbs, the network is at 100mbs and 35-45% CPU.

When I use the NV+ for HD DVD's the overall network speed drops back from 100mbs to 10mbs.

I can not work out why it would do this. I tried forcing the NV+ to use 100mbs but it keeps reverting back to "Auto-nogotiate".

Any ideas suggestion as to what I can do to force the NV+ or the Vista PC to run the network at 100mbs??

Any help would be kindly appreciated.

Regards

Dave

[Grievous]

Microsoft did this intentionally(no idea why, they swear it's supposed to help) in Vista, it happens when playing audio files too. I believe it's the multimedia class scheduler service(mmcss). You can disable it from the control panel.