MySQL is proprietary and some developers are now merging to Postgre SQL. If you are running windows you might come across this error. I am using windows 7 ultimate and encountered this error during installation. I solved the problem using the command
postgresql-9.0.1-1-windows.exe –install_runtimes 0
You need to navigate to where you downloaded the installer using the command prompt then you can use the command above to run the installer w/o the error
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