You did not post the MAKE && MODEL of the router for specific answers.
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You will need to re-set & re-program the router. IF the router is not listed in the source, THEN you will must search the web for info: SEARCH for router MAKE MODEL DEFAULT [Example: linksys cisco wrt54g default]
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Re-set the router to DEFAULT settings; Log-In using the Default IP address, Username, and Password.
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With an Ethernet cable, connect a PC to the router.
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- Reset router: With a straightened paperclip, press RESET button 30 seconds.
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Wait 60 secs.---
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On the PC: Click [Start] - Click [Run...] - enter: cmd [ENTER]
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At the prompt (c:\.....>) enter: ipconfig /all [ENTER]
- Ensure DHCP Enabled == YES
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At the prompt (c:\.....>) enter: ipconfig /release [ENTER]
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At the prompt (c:\.....>) enter: ipconfig /renew [ENTER]
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Open Web Browser: Connect to router IP DEFAULT address using the DEFAULT username and DEFAULT password.