This worked for me.
Hardwired Setup (for computers connected the router via an Ethernet cable)
1) Insert the disk and from the Easy Setup Navigator that auto starts, select Software Installation (it takes it a while to get going).
2) Now select Network Installation (even if you aren't making it part of a network, just connecting it to a router) and select next.
3) Now select Local Installation and click next.
4) You will now be presented with a select a printer screen, and if the PC is "hardwired" to the router the 1320 will come up and you can select it (putting a tick in the box if it hasn't done so by default), before you click next make a note of the IP address and keep it for the install of any wireless connected computers. Now click next.
5) Now you are asked to enter Printer settings, you can select whether you want to share this printer and whether you want to set this as your default printer. Once you've made your choices click Next
6) You're now brought to a screen which allows you to select if you want to install the users manual and system to order further laser toner, by default they are both selected, un tick what you don't want and select Next
7) The printer drivers are now installed (plus anything you left ticked, manuals etc) and you are finally presented with Congratulations screen and given the option to Print a Test Page! Print the test page as it will give you information to setup manually any machines connected wirelessly to the router.
Wireless Computer Setup
The setup is the same if your computer is connected to your router wirelessly up to point 4 above at this stage you will not have a printer to select so;
5) Click the add printer button from this screen as the Dell won't appear in the selection list at this stage.
6a) Leave the default port type as TCP/IP,
6b) Port Name you should find this on the test page you hopefully printed out, it's the 6th item down under the information below description.
6c) Enter IP address now this doesn't appear on the test page (a shame really) so hopefully you copied it down earlier, otherwise you'll need to go into your routers admin screen to find out what it is. It's also a good idea to tell the router to "reserve" that IP for the printer (each router does that differently). Once you've enter the IP address select next.
7) You are brought back to the Select a Printer screen, this time though the Dell appears in the list with a tick next to its name (provided your connected to the router and the printer is turned on an also connected. Select next.
8) Now you are asked to enter Printer settings, you can select whether you want to share this printer and whether you want to set this as your default printer. Once you've made your choices click Next
9) You're now brought to a screen which allows you to select if you want to install the users manual and system to order further laser toner, by default they are both selected, un tick what you don't want and select Next
10) The printer drivers are now installed (plus anything you left ticked) and you are finally presented with Congratulations screen and given the option to Print a Test Page with it's accompanying sense of satisfaction (if it prints of course!
You will see that this is for a Dell printer but I imagine it will work .