Some tips from when I was into video capturing on my (*SE system (nor Win2k, much better):
Setting the virtual memory is one tweak, another is setting the typical role of the computer to a Server (utilizes memory more effeciently), another is making the size of the swap file static: what you do is specify the min and max values to be the same, like 256 and 256.
Turn off all the Autostart features. This is the feature that will start WinAmp or whatever when you pop in a music CD and the same feature that will start up the install shield when you put in a data CD. Although some find this feature useful, this features causes Win9x/ME to "poll" the drives to keep an update on what is there. This can interrupt DVD playback.
Also, and this may sound funny, disable the clock in the taskbar at the bottom of the screen. Yes, yes, I know. But, when I was capturing a full motion video I had to tweak my system way out. And, these were all reccomendations (aside for the autostart one) from Matrox themselves on how to improve capture performance.
And, they all worked. http://www.avsforum.com/ubb/smile.gif
Another thing you can get, which is fun in itself, is X-Teq Systems X-Setup
. Its essentially a GUI for registry tweaks and hacks. So, instead of using regedit and typing stuff in, these guys made a program that allows you to check and uncheck what you want. And, I mean everything. All kinds of features. For Win9x and NT.