Go to www.canon.co.uk

Click "download Software"

Click "iR Series"

Click (for example) "iR5000i"

Pick your operating system

Pick your language

On the interface selection page, choose "PostScript"
On the next page, choose the latest version "Printer Install"

Download the file

Extract it to a folder on your disk

Type "\\fs-print.doc.ic.ac.uk\printername" in Start->Run, and 
click "OK".

The add printer wizard will prompt you for the model of the 
printer - click "Have Disk".

Point it to the folder where you extracted the driver. There 
will be a directory structure created within here, and you'll 
need to find the relevant folder within it. It should be fairly 
obvious though.

(In my case, I extracted the driver to 
C:\DL\Canon_Printer_Driver, I'm using Win2K, and the version I 
downloaded was 1.3.1 english, so the folder I had to point the 
wizard to was: 
C:\DL\Canon_Printer_Driver\PS3V131_WHQL\uk_eng\printer\win2k_xp)

Then, the wizard will ask you which particular model the printer 
is. The driver is fairly generic, and has ranges of models it 
supports. In the case of an iR500i, you'll want to pick "iR5000-
iR6000 PS3"

The wizard should complete without further questions - you'll 
now be able to use the printer.

Windows XP
==========

There is often a lot of trouble getting printing to work with Windows XP.
Here are some things you might try:

(1) Untick 'Use simple filesharing' in the Windows XP explorer
options. Simple filesharing prevents proper authentication (the username
you type in when prompted is ignored). You will need to untick this in
order to connect to file or print services.

*Reboot* after doing that. Windows XP doesn't ask for it, but still.

(2) Connect to Samba by opening home directory via \\fs-homes\username 
entering username as WIN\username, then Windows password.

(3) Printing by using \\fs-homes\PRINTER.

The rest is straight-forward - just pick the correct PS printer driver 
from the Canon site and install. Then setup he right configuration (e.g. 
paper feeder, staple unit etc).