Did PostgreSQL get installed? If so, could you please attach the 3 most recent files in the C:\Program Files\PostgreSQL\8.3\data\pg_log directory to a
support request so that we can look at it in greater detail?
If PostgreSQL did not install correctly, please try removing it completely and attempting to reinstall per
this tutorial. Perhaps removing the vestiges of the software will help.
If it doesn't, please tell me what the exact text of the error says and where you see it and we'll go from there.