Problem setting up PostgreSQL

Hello,

I am attempting to install PostgreSQL.  I downloaded 8.2.12-1zip from ftp9.us.postgresql.org and then followed the
installationinstructions  outlined in http://pginstaller.projects.postgresql.org. I am installing on a Windows XP
machinewith an NTFS file system.  I opened the zip contents from a temporary folder with all internet security
functionsdisabled.  

When I reached step 11 in the instructions, I received an error message: "Internal account look-up failure. No mapping
betweenaccount names and security ID was done."  I retried several times using a new download from a different mirror,
butalways received the same error message. 

I searched for and found a prior reference to this message (Sept 04 2008) but ws unable to retrieve the full message
andresponse.  Can you offer any suggestions for dealing with this problem? 

Thanks,
Bill Herbert