Windows 95 Dialup Internet:Modem Problem

I installed a modem for a client on win95, everything seemed fine. I installed the Driver, Protocols and etc. etc. BUT when I tried to dial up. It gave me an error: "Could not dial because the socket is already open. Some other software might be using the modem". And of course there was no other software using the modem. I tried installing evering from scratch. This didn't work. Any suggestions on what the problem might be. (I am a bit reluctant on reinstalling windows since I doubt I will havethe neccecary drivers and it is an fairly old system).