Hmm, the info you are giving me is kind of vague so the problem could be anything so here are some questions

What wireless router do you use?
Do you have a good wireless connection on your PC (the green bars)?
Are you sure that your PC is connecting on YOUR network and not another one in the neighbourhood?
You might want to change your wireless channel to prevent interference from other networks.
"Oh, that would be a great idea!" -Mahatma Gandhi- (when asked what he thought of Western civilization)
30/05/2008 : Started on VSRO! I like it!