Problem running post-install step. Installation may not complete correctly. The database cluster initialisation failed

1. Uninstall PostgreSQL

2. Delete the postgres user if it still exists.

   net user postgres /delete

3. Create the postgres user with a password you can remember

4. Add the postgres user to the Administrators group
5. Add the postgres user to the Power Users group

6. Run a command window as the postgres user

   runas /user:postgres cmd.exe

7. Run the install file from within the command window.

   C:\Download\postgresql-9.1.4-1-windows.exe

   This should run the installation successfully.

8. Remove the postgres user from the Administrators group.

http://dba.stackexchange.com/questions/10241/postgresql-the-database-cluster-initialization-failed