pg_ctl less than useful error message on windows when privileges wrong for postgres

I have a client who mistakenly gave the postgres user on a windows  
machine admin privileges.

This mistake results in the service being unable to start up due to  
postgres refusing to start with admin privileges.

The error message from pg_ctl start -D bindir is PG_CTL.."could not  
locate matching postgres executable"

Is it not possible to provide a more useful error message ?

Dave