Cannot connect with WEP Encryption

I have had my new iMac intel for about 5 days now and I must say, it's been amazing. It's a welcome change from the dark and gloomy world of windows pc's. I have just one problem connecting to my wireless network when WEP Encryption is turned on. The AirPort extreme card on my imac can connect to the network fine without the WEP encryption, but as soon as i turn wep encryption on, and enter the code on my imac, it refuses to connect, sometimes saying the password is incorrect or other times just saying there was an error in the connection. I've checked the password many times and my windows pc can connect to the network fine using the same password. Is there anything I'm doing wrong? Am I selecting the right type of WEP? If I cannot use WEP anymore for some reason to make it work with my iMac, is MAC-Address protection safe enough? Thanks in advance for your help.

I have just one problem connecting to my wireless network when WEP Encryption is turned on.
I along with anyone else would have no problem connecting to your network.
I could sit outside your house and crack your WEP key sometimes in minutes using tools readliy available on the internet.
Even if you turn on MAC Address protection also it offers no security either. MAC address can be spoofed and detected.
The only security you should consider using is WPA.

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