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On a windows 8.1 system: Error messages 2503 and 2502
Error 2503 = Runscript when not marked in progress.
Error 2502 = Unable to complete
These errors relate to a problem with permissions within Windows OS (operating system). Please ensure you are the administrator of the OS.
Use the windows clean up utility to uninstall programs and then install the required programs.
Try to enable to built-in administrator account and check if you are able to install or uninstall programs successfully.