Installing postgres on win XP

I am trying to install Postgresql 8.0.3/ 8.0.2 on windows XP.

I get following error:

This installation package cannot be openned. Verify that the package exists 
and that you access it, or contact the application vendor to verify that 
this is a valid windows installer package.

This happens right after I click on "Start>" button after the language 
choice window.

Appreciate your help.  Thanks,

Andy



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