Register and run PostgreSQL 9.0 as Windows Service

For a while i have my db running on a command window because im not figuring out how to run it as a windows service.

Since i have the zip file version downloaded. how can i register the pg_ctl command as a windows service?

By the way, im using the following line to start the server:

"D:/Program Files/PostgreSQL/9.0.4/bin/pg_ctl.exe" -D "D:/Program Files/PostgreSQL/9.0.4/db_data" -l logfile start

Thanks in advance.