Wireless Router

[TheDarkShadow]

My mom recently got a wireless router for home (finally) the router works fine on my lap top and my sister's laptop, however we cannot get it to work on the desktop. the belkin setup is terrible for trying to fix the problem yourself. you go through the setup up and when it doesnt work it says call customer service. there is no trouble shooting at all. I've talked to customer service and frankly it sucked. It was awhile ago so I dont remembe the steps I went through.

I'm no computer wiz and with a dialect difference I may have not went throught the steps correctly.

The desktop is XP and hooked up via ethernet cord
My laptop is Windows 7 and my sisters laptop is XP and hooked up via wireless router

any help and suggestions are greatfully appreciated