You'll have to connect to the router with an Ethernet or connect with a computer that actually works with the router right now to get to it's config. Like I said you should be able to get to it with 192.168.0.1 or 1.1 and the credentials are usually just admin and password, or admin admin.
edit:
Yes there should be a way to allow it to take older protocols, if you go to device manager > network adapters> your adapter > right click to properties > advanced(or the tab that gives you a list box of things to pick from), one of the items in the list box will give you the option of what protocol to allow. You might have to do so digging around, every adapter's driver is a little different than the next.