If you want reset linksys E1200 router then follow this blog- How to Reset Linksys E1200 Wireless N-Router,which i have discussed in same blog.
Step1: To find your router's IP address, click on "Start" and open "Run" or hold down the Windows key and strike "r." In the run box type "cmd" and click on "OK." type "ipconfig" in the next window and hit "Enter." This will bring up your local network information. The router is your gateway to the Internet, so the number listed for the gateway is the IP number of your router.
Step2: Put username and password if your router or modem requires it to get logged into the router. Click on "OK."
Step3: Click on the "Wireless" tab in the top bar of the next screen. Choose "Basic Wireless Setting" if it is not set by default. In "Wireless Network Mode," pick "Enable."
Step4: Pick a name for your network and enter it in "Wireless Network Name (SSID)." This will be what you look , when searching for the wireless connection. Click on "Save Settings."
Step5: Click on "Wireless Security." Choose "WPA" for security mode. This setting will allow you to pick your own password and work on the easiest way. For security setting more boxes will appear on screen. Put your password and after completing the all setting click 'Save Settings'
To know more about router admin password or how to set admin password in a linksys router then follow this article. How to Reset Admin Password in a Linksys Router.
If you are facing problem with your Linksys Router Setup and Configuration, You can reach V tech-squad online technical support at their Toll Free No +1-877-452-9201.