If you are not using wireless modem, you need to buy another basic wireless router ( not wireless modem) so that you want to avoid cables to connect to the desktop.
The Modem output (internet) can be connected to this wireless router input.
If your Desktop doesnt have wireless Adaptors, you need to buy one wireless USB Adaptor as well.
I have a Netgear (not wirless) adsl moden coneccted to my main computer but want to get internet in my bedroom desktop computer. I want to know how to do this.
Hello and welcome to Tom's Hardware Forums.
Guessing that you don't want a cable to run from the router to your bedroom, why no consider powerlin networking. You cable from the router to a unit which plugs into your electric mains circuit. Plug another unit in the bedroom and cable that to the computer. Two standard Cat 5 cables and the powerline units are all you need.