Assuming nothing else changed with the new router, try this first:
Step 1: On the XP PC, do the following:
Click Start. Click Run. In the "Run" box, type (without the quotes) "cmd" and click OK. You'll get a black dos-like box with a blinking cursor. Now, type in the following without the quotes!:
"ipconfig /release" and tap the enter key. Wait till it says the command has executed. Now, once you get the indication that the command has executed, shutdown Windows and POWER DOWN THE PC.
Now, the XP PC should be powered OFF. Next steps in this order:
Power Down your Apple router. (Note that your wireless machines will not work during this power down time).
Power Down your Cable/DSL Modem.
OK, now everything should be off: The cable/dsl modem, the Apple router, and the Windows XP machine. Now, do the following in this order. Pay attention to the wait times I mention:
After a couple of mins, Power UP the Cable/DSL Modem. Let it completely get up to speed, sync-wise...usually a minute or two after power up as it resyncs with the cable or phone company.
After that time period has passed and the modem has synced up again, Power UP your Apple Router. Once again, wait a couple of minutes after powering up the router before doing anything else. It needs to sync up with the cable/DSL modem. Give it at least two minutes to do that.
After that time period has passed, power UP the XP PC. After it boots to the desktop, see if you've got a working internet connection.
Had a linksys and worked fine from ethernet. Got a new Airport Extreme (Apple) and my entire Apple network of products work fine wirelessly, but the ethernet hooked up to the Windows machine doesn't work at all.
Baby step instructions please, how do you set up the internet on the XP machine with ethernet cable?
I must have changed some setting or something minor. Thanks