MacBook Pro print won't detect wi-fi enabled printers that are connected to my router

I have an Epson Artisan 725 that I am trying to establish a wireless connection with my MacBook Pro Mac OS X (10.7.5).  The print/scan in System Preferences will not recognize the wireless printer, even though I have validation that it is connected to my home router and transmitting a wireless signal.  I am able to establish a connection when I connect the printer to the laptop with a USB cable.  

Thanks for the suggestion, Shootist007, but that's not accurate.  There were no disks of any kind included with the MacBook Pro I bought.  I am very anal about keeping everything that comes with a computer.  I don't misplace or lose them.  I've been buying computers since '88, and I am very careful to maintain original items.  I searched the original MacBook Pro box several times, and there's nothing in there but the original purchase receipt from the Apple Store and the form fitting black plastic tray and cushion.
I did try wiring the system, and that's when it tried to restore Lion (and wouldn't let me do a restore of anything else).
Are you saying that if I do upgrade to Lion, and then do a system restore, then the buyer will not be able to use Lion?

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