Windows XP sp2 ISP - Virgin trying to install ZyXel Router using either wireless or eithernet cable. System can talk to router and access the various settings but it will not go out to internet. Having spent a day on this trying various settings I have not been able to have any success. It did work initially when I added a USB wireless plug in but once I added the security key it stopped working.
Router encryption works in different ways in different routers some come with a label on the underside with printed WEP and or WPA keys that you type in when prompted during the first attempt to connect a Wireless client machine thats the easy way
Other Routers will prompt you when you turn on wireless security encryption to input a Pass Phrase this will generate and display a table of keys one of these keys is what you need to enter into the client when prompted
One very common mistake at the client end is to try using the Pass Phrase you entered into the Router
There may be other methods but generally a little time reading the manual will help
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