Slow Download After Reinstalling Windows in Troubleshooting Posted August 12, 2019 · Report reply On 8/5/2019 at 12:35 PM, UncleKeith said: i changed something inside and it made me lose internet for a whole week. You should Backup your router's settings. Log into your router using a browser. Depending on your router, the address could be... http://192.168.0.1/ ...or something very similar. Check the on the router itself for the login credentials, but the defaults are usually: username = admin / password = password. There should be an option to Backup/export your router's settings to file. Then if something goes wrong, you can restore the settings from that file.