If on installing OpenERP 6.1 using all-in-one setup, pgAdmin is note getting installed or you are not
able to select pgadmin while installation then you might be having a registy issue with postgres
application. To solve this king of problem.
Follow these step given below:-
Step1- Go to regedit, type in serah or run and enter.
Step2- Then ctrl+f to search, enter postgres or pgadmin, select only keys and enter.
Step3- All the keys with name postgres or pgadmin or postgresql will be listed, delete all of them
Step4- Now reinstall Openerp using the all-in-one setup.