Macbook won't stay on internet

Help please!!! My 2007 Macbook keeps getting kicked off the internet. My sister's Macbook Pro is fine and i've already reset the Airport Express we use. My computer keeps saying that it can't find the wireless device when I go to Airport Utilities and makes me keep rescaning. I can get on the internet maybe 2 times a day for about 10 minutes at most. When I go to System Preferences > Network, the AirPort says it's on with a gold light and that it's turned on but not connected to a network. None of the networks appear in the Network name and when I hit Advanced, all of my previous networks are gone. I tried following other users advice and hope I didn't mess up my computer, but I may very well have made things worse. The Network Diagnostics say everything is failing and is in red. I deleted my Systems Configurations earlier along with the things in the left hand menu under System Preferences > Network > 802.1X. I have also tried deleting the AirPort and then creating it again under Network. Under TCP/IP there are no IPv4 Adresses or Subnet Masks or Router numbers like my sister's computer has. I don't know what else to do and don't want to break my computer anymore. Thanks for your help.
Noel

Your best bet is to clean up all available preferred wireless networks under Apple menu -> System Preferences -> Network, and start fresh with the network that is available using the Configure option under the Network panel.

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TS1398 Help! MacBook won't connect to the Internet on my network. Never had an issue on other networks, other devices work fine, i.e. iPhone/iPad. Says it's connected. Plugged in Ethernet and tried other browser. Called ISP and all good on their end.

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You can't change it - just try aagain.
https://discussions.apple.com/index.jspa
Where you find these options:
Notebooks
MacBook Pro
MacBook Air
iBook
MacBook
PowerBook

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Macbook won't stay on internet

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