Connecting my eee pc to the internet

i have orange/wannado broadband at home and my asus eee pc wont connect wirlessly to the internet, ive tried it with bt connectiond too and it always comes up pending! i spoke to the place i brought it from and they told me id have to put windows on it to see if that would work as linux system may not be compatible but im reluctant to spend the money if it still isnt going to work, cany anybody help me???? thanks xXx