Make sure you have already setup an Access Point for the wireless network. You can use the WLAN wizard for setting up an access point for the wireless network.
Step 1 : Go to your Home Menu.
Step 2 : Go to Tools > Settings > Connection > Access point
Step 3 : Select the Create/edit option for the access point that you created for the wireless network.
Step 4 : Scroll down the available options till you reach WLAN security settings
Step 5 : Go to the WPA/WPA2 option and change the encryption type to EAP
Step 6 : Select the EPA plug-in settings. Make sure it is enabled.
Step 7 : Based on the EAP mechanism used in the desired network ,raise the priority of EAP-PEAP and disable the other two mechanisms - EAP-SIM and EAP-AKA.
Step 8 : Choose User name in use as User defined
Step 9 : Enter your wireless network's username.
Step 10 : Choose Realm in use as User defined
Step 11 : Enter the active directory under Realm.
Step 12 : Make sure EAP-MSCHAPv2 is enabled, disable the other two default access mechanisms.
Step 13 : Enter your user name as- active directory\username. Enter your password and select No under Prompt Password.
Step 14 : Go to the Cipher page and enable all the options for the ciphers.