I tried to install postgresql 8.4 in my windows 7 (64 bit). But it fails with following messages in log
Initialising the database cluster (this may take a few min
Had this same problem trying to install on my company computer (PC running Windows 7). If you are not admin on your computer, you need to install it within your personal "User" folder (not in the "Program Files" folder(s) at the root).
If you still can't access Postgres:
Once you'd installed it under your "User" folder, use the 'Run' program and type in "services.msc" and hit enter. In the window that pops up, go down to your postgres installation, right-click and go to "properties". In the "Log On" tab, select "Local System account" then go back to the "General" tab and click "Start". It should boot after that.
After this, I was able to run "pgAdmin" and access the database (after entering the password I used during installation).