Trouble Connecting To Password Protected Networks

Hello. I'm having trouble with the wireless side of life.
I'm in Japan and I'm trying to connect to YahooBB wireless with my macbook. Everytime I enter the password, there is a message saying the connection has failed. I have also tried to connect wirelessly at work. I enter their password and I get the connection failed message. The only place I can connect is at the Apple Store which doesn't require a password.
Could there be a reason as to why I can't connect with a password protected network? I correctly enter the passwords over and over again.
Excuse me for such a silly question (I'm new to Mac) but...do I need to purchase Airport Express to connect at work or with YahooBB? I've always assumed there was no need.
Thanks for your help.

What's the difference between hex and ASCII?
It is only how the information is presented. Humans can remember the ASCII string easier. The underying bits are the same. You can use tables like this one to convert back and forth between the ASCII characters and their hexadecimal representation.
If you can, the best wireless encryption to use is WPA2. If you can't use WPA2, use WPA.
128 bit WEP is very strong and adequate in most circumstances.
64 bit WEP (sometimes called 40 bit WEP) is very weak and should be avoided.
The type of encryption needs to be set on the wireless router (base station). Your Mac will then present you the correct dialog box to enter the password.

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