I tried to reinstall a modem in xp2. The select com channel window did not show an unused com channel. Knowledge base claims that the, to avoid this problem, you must install on bus 0 or bus 1. It suggests asking your board manufacturer how to do this. Asking the board manufacturer this question is useless - does anyone know how to select a bus for a modem or how to get a new and unused com channel displayed or any other way to work around this problem. MS claims that this problem is caused by a bug in their software.