When looking at soundcards a few years back and fired an email to Echo and M-Audio about their cards, and they both got back to me in a few days. Last May U upgraded my system from Win98 to Win2K and had problems getting my Delta 44 to work. I called them during business hours, was on hold for maybe 5 minutes, then got a helpful person who told me what to do, and his suggestions did work for me when I got home that night, so I was happy. I'm suprised you can't find a phone # for them.
If you have any questions, feel free to post here or PM me and I'll try to help. I've had my Delta 44 running on Win98, Win2K (on an old PIII) and now on a new Dell PIV with WinXP.
Good luck!