Oracle – unexpected error occurred while installing the package

Hi experts,
I have decided to give Windows 8 a few more days of my life (before deciding if I am going back to Windows 7). So I am re-installing many of the programs that I used every day on my Windows 7 setup. Some of them are giving me this – "Error code 2503". Any idea would be really appreciated.

Thanks.
Error: The installer has encountered an unexpected error installing this package. This may indicate a problem with this package. The error code is 2503.
