One overall suggestion...If after many hours of trouble shooting a wireless router and you still can’t figure out what to do just go to Google and type in your wireless router model and trouble shooting and you will find many more tips.
The following are some links for managing those specific issues:
Tips for wireless router troubleshooting:
Resetting a router password (also has links for specific models)
Here's another good site with sugestions for resetting your wireless router:
Setting up a wireless network:
Here's another good one from Microsoft for setting up a wireless network: