My friend gave me a linksys wireless -g 2.4 ghz speed booster router but need a password and he cant figure it out?? what do i do ?

You can reset the Linksys back to the factory defaults.
Connect the router to your computer with a LAN cable.
Then power up the Linksys press and hold the pinhole RESET button at the back of the Linksys foe 30 secs.
Open a browser and enter the Linksys configuration URL (enter this)
http://192.168.1.1
The default login = admin
The default password = admin
You can then configure the Linksys wireless settings.

To secure youe wireless network from unauthorized access. please click on this link and follow my instructions :-
http://www.fixya.com/support/r3559128-wireless_router_security

Connect your router to computer with ethernet cable then you can access it with following default link. http://192.168.1.1 or http://192.168.0.1 or http://192.168.15.1 or http://192.168.2.1 If you are not able to access it with above ip then check your computers ip address gateway ip is your router ip try with it. Then it ask for user name and password. Type user as "admin" and password as "admin" or "password" or blank. Then you can see configuration page of router. Then click on wireless then wireless security then WEP note down that password it is your password to connect wifi. . Let me know if you need further assistance. Thanks for using FixYa.