All you need to do, is set-up an account for your mum on any computer (yours?).
Use Dial-Up Networking to configure the connection on your mum's machine and if it hasn't been up-dated, install Internet Explorer 5.5 (6.0 may be over the top!) as I would assume, it's a fairly slow processor.
Ignore totally, the CD's, as they only load a load of junk you don't need anyway.
Install a Shortcut for her connection on the desktop and away you go!