Hooking up the DECA wireless

I have no way to get a hardwire from my computer room to the back of my TV.  My installer hooked up the equipment and said "all you need is a hardline to the baox and your good to go"

My question is, can I set up a wireless access point to convert my wireless signal to a hard line thus finnally solving the how do you do this wielessly mystery.  I am using a wireless print server with an ethernet port.

Anyone else tried this.