Here is a quickstep to install openerp in windows :

1. Download OpenERP
http://nightly.odoo.com/8.0/nightly/exe/odoo_8.0.latest.exe

2. Setup Postgresql Account
I assume we already have postgresql in our Windows. Go to PgAdmin -> Server -> Login Role.
Right click on Login Role and select New Login Role. Create a new account called “odoo” with create database permission.

3. Install Odoo
Don’t install PostgreSQL. When the database connection show up, just enter your PostgreSQL with user “odoo”.

4. Go to http://localhost:8069 and we can start to setup OpenERP