hi,
take a look at:
Setting up the WebLogic Server as a Windows Service
http://e-docs.bea.com/wls/docs60/adminguide/startstop.html#1026476 You have to append the following command:
-password:"your_password"
at:
installNTservice.cmd
just after:
rem *** Install the service"
C:\bea\wlserver6.0\bin\beasvc" -install -svcname:myserver -javahome:"C:\bea\jdk130" -execdir:"C:\bea\wlserver6.0" -extrapath:"C\bea\wlserver6.0\bin" -cmdline: %CMDLINE%
I hope it helps.