We'll need to know a bit about your network...
From a PC which is connected to the network, can you go to a Command Prompt (its in the start menu) and then type:
ipconfig /all
Please post the results of this command.
Also if you still have the printer setup on your PC some screenshots of those settings would be nice. And the printer should have in its menu's the option to print the configuration. What I'm wanting to know is what the current network settings are for the printer.
It would be best to set the printer with a static IP but if you're in a hurry to get it working then here is what you could try before doing the above. Download this:
http://downloads.canon.com/cpr/software/ir/PCL5e-c_v8.70_Win2k-Win7_INF.exeAnd run it and it should extract somewhere, then run the setup.exe and follow the wizard. At some point it will search your network and may find the printer and set it up for you. If not, then we'll definitely need more information about your network to help you.