On the PC, on the desktop area you should have a computer icon called "network neighbourhood".
Press right mouse button and goto properties.
From here you will have a list of installed network cards, adapters and protocols.
You should have Dailup Adapter (for the modem) and TCP/IP protocol.
If like this error suggests you don\'t have TCP/IP protocol, click on Add, then select protocol, click on Microsoft and then click TCP/IP.
This should add the protocol. Now click Apply or OK or whatever and it should be installed. You will need to reboot.
Also you may need Windows Installation disks.