I am using PCTel HSP56 micromodem for the past five years under Win XP - SP1. Recently, I upgraded the OS to Win XP - SP2. Then onwards, it is giving an error - "No dial tone". when I use the same modem on Win XP - SP1, it is again working fine. What do I do?

Computers & Internet - Directv - PCTel (56k micromodem)