[mothered]

well, are you using a desktop PC or a laptop?

No difference and completely Irrelevant.

It's predominantly an Issue with either (or a combination of) the tool, network card or user Input (commands etc).

I think it is the problem of his network card have to be for wireless internet.

As per my post above:

Stating the obvious, Is your network card/wireless adapter compatible?

That's one possibility, there's a few others as already stated.