I'm attaching the sysinfo file (
RapidShare: 1-CLICK Web hosting - Easy Filehosting), it'll tell you my entire config details. There is a password to open the file, I'll PM that to you as I don't want the world and sundry to peep. I'm running an AMD Athlon II x4 620 (2.6GHz Quad, 2MB Cache), 4GB Crucial Ballistix at 4-4-4, I have a Radeon 3200 integrated motherboard, the 780G with 256 MB of assigned graphics.
There are three non-WHQL drivers.
One is the RALink Wireless card, it's a Linksys Wireless network adapter which I had to force some drivers on to get it to work.
Another is the m-Audio Delta 66, it's an audio card for pro users. This will probably take some time and I'm pretty sure MS can't do much about it - it will have to wait till a-audio releases a new driver.
Disabling these two devices do nothing for the latency - a little improvement (around 50-60uS less) but nothing earth-shaking.
The third problematic driver is the IEE1394 driver that is refusing to play with connected Firewire hard drives. It is probably not related to the network issue, but it does not indicate the need for an update. It was not working at all when it installed the default driver, and when I changed it to legacy it detected the drive and connected, but performance was terrible.
Since you don't use inf files any longer I can't seem to find the device ID for the hard drive that is not playing along, but the controller is the Initio chipset. Also, the driver is a WHQL driver that comes with Windows, and it does not show in the update list.
Anyway updates have run as you can see in the process list, I will restart as per instructions and check afterwards again.
Edit: The latency has not improved much. I get average 400uS now, and peaks of 700uS. I'd be willing to look at ideas. Did your test hardware have an add-in graphics card?