Connects in one house and not another

Hello,

My name is aaron. Little sister has an acer one aspire AO110 netbook. I have successfuly completed a clean install of xp pro which has all drivers loaded and installed. Issue I am having is that in my house it works perfectly wireless. In her house it doesn't. It cannot acquire a network address. there are tow other laptops in the house hold that work perfect on the wireless router (belkin n150). Can someone please give me a solution or a fix..... apart from throwing laptop from agreat height out of the window lol

Aaron