[GENERAL] Installation problem -- another installation is in progress

I am attempting to install the postrgresql-8.3.3-1 download on Windows Vista. When I get to the "Ready to install" dialog and click OK, I get the message "Another installation is in progress", and I need to click on cancel and end the installation -- otherwise I am in a loop. This happens even after I reboot. Any help would be greatly appreciated.

Susan

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