The build number is the month/day that it was released. 1116 was the original release date last year.
I’m a dummy! HWMC is a known problem with the GF2 video cards. I’ve been using the Radeon for so long that I forgot about it. With your CPU power you don’t need HWMC anyway.
You’re right the old 2.5 version of PowerDVD did have bad stair-stepping. PwrDVD 3.0 was released in Oct/Nov. 2000 and has been updated several times. The build 0525 added Dolby headphones and HWMC for the Radeon video card and build 06?? Supports DXVA for use in WinXP.
"Basically, it's taking a field and duplicating the missing lines, giving the picture a blocky, stair-stepped effect. PowerDVD also does this for FBI warning screens and single-frame menu screens. So you're saying that the new build fixes this so it acts more like WinDVD? Cool..."
The problem is with WinDVD not the soundcard drivers. You should contact InterVideo tech support and ask them for a work around to this problem.
To determine the build number in PowerDVD bring up the "About PowerDVD" window and then double click on the word "PowerDVD" on the left side...
It sounds like WinDVD is not picking up the DMA buffer time used on the soundcard.
What version of PowerDVD are you using? I've found that PowerDVD 3.0 build 0525 has very good deinterlacing for video.