do you have the manual for the router? all you will need to do is enter the config pages by using the router ip enter user name and password often if left default this will be admin, password or admin admin or user password or similar and just turn off wireless. If you do not have the manual here is a slightly more complex way
press win key and r at the same time.
in the run box type cmd.
type ipconfig /all
look for default gateway.
type default gateway into browser window ie 192.168.*.* (the stars will be numbers)
type in user name and password you may have set this when you first set up router or try combination as I mentioned.Then simply disable wireless which will be easy to find once you open the config