Which one did you d/l and install? Also, is it an HP Omnibook XE4400? If it is, then the first choice under the Drivers menu should work - it's labeled "hp omnibook XE4400-KD series Driver Package for Window XP" and it includes a file for "Conexant 56k ACLink Modem driver v5.03.09"... If it's not an HP Omnibook XE4400, please post back w/ the make/model of the computer so that we may find the right driver for you...