Wireless Base Station MN-500 - Wep Password

I have a 5 year old Wireless Base Station MN -500 connected to the cable 
internet from my internet provider.  I set this up on a computer that I
can't 
access the hard drive.  I am currently running 2 PC's through a wireless 
remote connection.  Just purchased an Apple - Macbook and when the new 
computer asks for the Wep password, it's not recognizing anything I put in
it 
so that the new computer is not able to connect to my wireless router.

Microsoft tells me I no longer have sup****t for this router.

Help!!!  What canI do?

Thanks,

Melane in Wisconsin