Initdb Fail installing PostgreSQL 8.0.0 Beta 4

When installing PostgreSQL 8.0.0 Beta 4 on my windows xp professional
machine (with SP2 installed) The logfile contains the following and
the installer rolls back.

-----------------Logfile-------------------------

The files belonging to this database system will be owned by user "postgres".
This user must also own the server process.

The database cluster will be initialized with locale C.

fixing permissions on existing directory C:/Program
Files/PostgreSQL/8.0.0-beta4/data ... ok
creating directory C:/Program Files/PostgreSQL/8.0.0-beta4/data/global ... ok
creating directory C:/Program Files/PostgreSQL/8.0.0-beta4/data/pg_xlog ... ok
creating directory C:/Program
Files/PostgreSQL/8.0.0-beta4/data/pg_xlog/archive_status ... ok
creating directory C:/Program Files/PostgreSQL/8.0.0-beta4/data/pg_clog ... ok
creating directory C:/Program
Files/PostgreSQL/8.0.0-beta4/data/pg_subtrans ... ok
creating directory C:/Program Files/PostgreSQL/8.0.0-beta4/data/base ... ok
creating directory C:/Program Files/PostgreSQL/8.0.0-beta4/data/base/1 ... ok
creating directory C:/Program Files/PostgreSQL/8.0.0-beta4/data/pg_tblspc ... ok
selecting default max_connections ... 100
selecting default shared_buffers ... 1000
creating configuration files ... ok
creating template1 database in C:/Program
Files/PostgreSQL/8.0.0-beta4/data/base/1 ... initdb: failed
initdb: removing contents of data directory "C:/Program
Files/PostgreSQL/8.0.0-beta4/data"

---------------------------------------------------

I then tried all other 8.0 beta versions and get the same error. I
also tried to install it on a Windows 2000 server (with SP4) and the
same error happens.

I initilize the installation under the Administrator account. I have
the system service set to run under the postgres account and I made
this account a member of the Users group.

Any ideas what's causing this or how I can get this installed?