Here is how u get ur guide back for ET:
1.) Go in consle type /pb_myguid to check if u dont have one
2.) Disconnect from server then Enable punkbuster on menu
3.) Go in consle and type /pb_mycdkeyreg
4.) Then restart ET (Exit Then Open Again)
5.) Enter a server then u have a guid!!
Just to tell people who dont know a guid is something that stores your xp, levels and all that stuff so try it out!