guys! just saw this topic.. you have two options, 1. go to c\windows\inf\wpdmtp.inf.. (well if you see it, means old windows) then go to www.infdump.com download the new wpdmtp.inf and replace the older one, (its still doesnt work? it means windows version is not support your modem theres no way to install in those windows) you have the the last option. reinstall your windows with newer xp version, such as xp sp2 2002 is one of them, after it dont install any programs first, but install PC 1st, (bcs some program can change inf contents and state of your windows like avira etc ) your modem will be 100% installed, after it you freely installed your antivirus etc. hope it will help. sorry for bad english