script for generate randomize administrator password which make log file to recorded new administrator password with associated computer name on it

Hi

I Need VDS script in order to change domain client local administrator password in my domain ,and put this script in startup script via group policy, but for security purpose  I want to randomize local administrator password and log new password set for each computer on a text file, I want to over write the old password of eachcomputer in log file with new one in order to have the update log file ,my support team some times need administrator password for troubleshooting.

I need a script for generate randomize administrator password  which make log file to recorded new administrator password with associated computer name on it and each time new administrator password set it over write the old record on the log file and update the content of log file automatically.

Regards