|Your post says "Windows XP" but I assume this is the computer you use regularly and not the computer you are inquiring about; hence, Windows XP will not run on a 25MHz processor.|
Anyway, if you have installed the drivers with the three disks and still are unable to connect to the internet, you may not have TCP/IP installed (assuming you are using a high-speed connection).
For Windows 95, the TCP/IP would be on the disks (or CD ROM), and you can install it by going to
Start > Settings > Control Panel > Network > Click "Add" > Double-click on "Protocol" > Microsoft > TCP/IP.
If you are trying to create a dial-up connection, you need to set the parameters in the Control Panel for the particular COM port that you are using. This would usually be COM1.
Do you have the original owner's manual for the computer? It would probably have the recommended settings in there.