Lost postgreSQL password in Windows installation
Having previousley tried to delete PostgreSQL and reinstall it I realise I had neglected to delete the files the uninstall leaves behind.  In a Windows XP environment these are found in C:/Program Files/PostgreSQL/9.2  Deleting the remaining files in the directory 9.2 and then deleting the directory PostgreSQL allowed me to perform a completely new install of PostgreSQL without any failures.  Of course the new installation process requires input of new passwords, this time I made a note of them :)