If you are experiencing router reboots, try using the crash recovery method and reflashing an earlier firmware.
Use the following steps to crash recover your DIR-450:
Step 1 Download the firmware you wish to use from our support site.
Step 2 Unplug the power from the router. Hold in the reset button and plug the power back in. Continue holding for 10 seconds and then release.
Step 3 Statically assign an IP address to your computer in the same IP subnet range: 192.168.0.x (where x is any number between 2 and 254). Your Subnet Mask should be 255.255.255.0.
Step 4 Open a web browser such as Internet Explorer or Netscape and enter the IP address of the DIR-450 (192.168.0.1).
Step 5 You should see the crash recovery page. Browse to the location of the firmware on your hard-drive and click the Send button.
Your router should now be stable and ready to configure.