Please help with network printer setup

I have a desktop running XP hardwired to a FIOS wireless router. I have a laptop running Vista connected wirelessly to the network. I have an iPad that connects wirelessly to the network. For this, all devices work fine.

I have a Canon MG6220 printer that has built in wireless and Airplay printing. If I connect the printer to the router by wire, I can print on the XP desktop and wirelessly from the Vista laptop. Airplay won't work unless the printer is connected wirelessly to the network. I have done this and the iPad works fine. But the desktop doesn't work. It says the printer is off line.

Is there any way for me to set this up so that I can print from all three devices?

 

Have you tried this?
http://www.usa.canon.com/nw3s/CanonUSA/DownloadContents/English/0100369701EN.htm
It contains the Setup application, MP Drivers and IJ Network Tool necessary for setting your printer up on a network.

If the previous tool doesn't work.. Try this:
1. Disconnect your printer from the Wired LAN.
2. Connect the printer to your wireless (WLAN).
3. Within Control Panel, Remove the printer from your XP machine.
4. Go through the menus on your printer (if it has one) and find the IP address. If possible try to setup a static IP address for your printer because if it's on DHCP your IP address will renew and you will have to run through this procedure every time the IP changes.
5. If you couldn't find the IP in the previous step try to find it within your router.
6. Go to the Control Panel, then click Printers and Faxes, then click Add Printer.
7. An add printer wizard should pop up, click next.
8. Select Local Printer and uncheck Automatically Detect, click next.
9. Select Create a new port, in the pull down menu select Standard TCP/IP Port, click next.
10. Another wizard should pop up, click next.
11. In the Printer Name or IP Address field input the IP address from Step 4 (or 5). The Port Name field will automatically fill, click next.
12. This should default to Standard Generic Network Card, click next.
13. Wizard complete, click finish.
14. Now you may need to find your original setup disk that contains the drivers for your printer. If you can't find that disk, here is the link to those drivers LINK <click here=""></click>
15. It should ask you for the drivers. If it has detected your previous drivers then you should be good to go. Click next.
16. Keep existing driver, click next.
17. Name your printer and select if you want it to be your default printer, click next.
18. Select if you want to share the printer (not recommended), click next.
19. Select Yes to print a test page, click next.
20. Confirm that your test page has printed. Enjoy!