Well, after lots of trial and error, and searching all over the net, I finally figured out that I needed to create a new entry in the registry to restore the My Music folder.
Now I'm having another problem. I got itunes w/MM to work the first time I installed it, and it played just fine through foo & the KS, BUT, the next time I tried to use it, I got nothing -- Windows Task Manager Processes list shows foobar chewing up a bunch of CPU resources, but it won't open after closing itunes (which also still shows in the processes list, even though I closed the program before trying to open foobar -- I'm guessing that might be the problem...). Then itunes won't reopen. And all the while no music! When I try to shut down the computer I get a bunch of programs that won't close, with undecipherable or cryptic names (the only one that stuck with me was "uninteresting" -- another had a bunch of strange characters for the name, but had an itunes icon). So I (eventually) restart, and turn off the foobar pass-through setting in MM -- itunes will play directly, but not through foobar. Restart again, and foobar plays just fine, through KS as directed. But they won't play nice together!
This problem is mentioned in the forum where the itunes/MM link is posted, but no answers/solutions have been posted there. Has anyone else had (and solved) this problem?
SO I guess I'm back to foobar for now. Bummer, cuz this trick really had me excited (I have been completely unable to master the task of making foobar look presentable, let alone usable).