So, your computer is using DHCP, but your printer is statically configured for a different IP address range. I looked on OkiData's website, but couldn't find a printer called an M361, so I'm going to assume that your printer has an embedded web server that you can access to change its configuration. Here are some general steps to connect to your printer:
1. Configure your computer to use an IP address in the same subnet as your printer. To do this in Windows 7 click Start > Control Panel > Network and Internet > Network and Sharing center. On the left-hand side, click Change adapter settings. Right-click on the network adapter you use to connect to your network and click properties. Select the Internet Protocol Version 4 (TCP/IPv4) protocol and click Properties. Change the setting to "use the following IP address" and enter an IP address in the same subnet as your printer (but not the printer's IP address). Click OK to save your changes and close the network interface's properties window.
2. Connect to the embedded web server on your printer by opening a browser and going to http://<your printer's ip address>. Because I couldn't find the OKI M361 on Okidata's webpage, I don't know any details beyond this. Somewhere in there you should be able to change the network configuration.
3. Reconfigure your computer's network adapter to use DHCP by re-opening the network adapter's properties and setting both radio buttons to Obtain automatically.
As an alternative, you could just reconfigure your new router's DHCP server to use the same subnet that your old router used and then release/renew the IP address on your computer. Then you wouldn't have to reconfigure the printer at all.