(I'm guessing that this is a Windows XP or Vista question, rather than a Windows Home Server question (what these forums are for), but...)
The Speedtouch modem is an external (USB-connected) DSL modem.
The modem that keeps coming up is an internal (PCI) modem card.
Your options are:
1- install the drivers; or
2- remove the modem. (remember to shut down the PC, and pull the power cord, first.)
Your choice. Neither option will stuff up your internet connection.
HTH,