There's a midi note value assigned to each of Impulse's eight drum sounds. Just experiment with having your controller generate midi "note-on" messages. I think it's the wholetones between C-2 and C-3, though not sure about this. Assign the corresponding "note-on" messages to you...
My Toshiba Satellite M40X-112 still works fine with Live5 under WinXP Home.
Yet had to completely re-setup it once after it started glitching under Live.
Hope this won't occur any more.