Wep password rejected - Airport works but no internet connection

With my iMac i'am connected to internet via my Sitecom router WL143 and WEP 128bits hex password. My new MacBook won't accept the WEP password. Still get a warning that the password is wrong. My MacBook can see all routers in the neighberhood. Have ones tried at a familymember, internet connection works perfect (not Sitecom).
Is my type of router the problem? Do i had to buy an other brand?
Who can help. Thanks in advance.

Open System Preferences->Network and find your connection named "Airport". In the right column hit the "Advanced" button in the bottom right hand corner. In the drop-down select "DNS" and put either OpenDNS.com (208.67.222.222 & 208.67.220.220) or Google DNS (8.8.8.8 & 8.8.4.4) in the DNS settings and hit apply. See if one of those helps and you can tell this by opening /Applications/Utilities/NetWork Utility and see if you can ping apple or Google by the DNS (www) name with it. This way you can see if the it works.

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