Invalid Current Euid 500

Hello,

I installed PostgreSQL version 7.1.2 through the cygwin setup, however it
won't start.  Here's what it spits out:

$ initdb
The program
    '/usr/bin/postgres'
needed by initdb does not belong to PostgreSQL version 7.1.2, or
there may be a configuration problem.

This was the error message issued by that program:
/usr/bin/postgres: invalid current euid 500

Any ideas on how I can fix this?  I'm not planning on running an SQL server
on a win32 OS, I just need to test a program (which requires PostgreSQL),
and I had some trouble finding someone who could host a testdb :)

Thanks