The following bug has been logged online:

Bug reference: 1664
Logged by: Jack C. Holt
Email address: jackcholt@gmail.com
PostgreSQL version: 8.0.3
Operating system: Windows
Description: Binary Installer Zip Bad
Details:

I have tried to download the Windows binary installer for 8.0.3 from every
site listed on the download page and everyone seems to be unreadable by
WinZip. The no-install zip of 8.0.3 is readable the WinZip, however.

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TIP 4: Don't 'kill -9' the postmaster