Can't connect to network with mac, only pc.

I have a powerbook and have just installed an airport extreme card. I do not have my own internet connection and intend to 'borrow' connections that I pick up.
In the past I have used a friend's PC laptop &belkin wireless adapter to connect to networks accidentally found in both his house and mine. This was no problem whatsoever and a connection without passwords etc was possible in both.
When I try to connect my powerbook the following happens:
1. In his house: I can connect to an open apple network but the connection is unbearably slow while I can work on his computer from the same point relatively easily.
2. In my house: When I try to connect I get 'error in connection to linksys' or similar (maybe even get asked for passwords).
I have very limited knowledge of these things and have no idea what it means or what the problem is.
If anyone can tell me why the connection always seems to be slow or unachievable on my powerbook (when an old PC laptop succeeds) I'd be most grateful.

It could be as simple as the owners of those wireless networks didn''t want other people using their networks and have added a layer of security.
One you may also want to have a look at these recent cases involving using other people's wireless networks.
UK Case
http://news.bbc.co.uk/1/hi/technology/4721723.stm
US Case
http://money.cnn.com/2005/07/07/technology/personaltech/wireless_arrest/

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