One other thing to try that worked for me was to load the 2008R2 driver then delete the old partition, create a new one letting the OS create the 'System' partition that is about 350 MB, then reboot, load the 2008 R2 driver once more and it let me install WS 2012 on my PE1850 with the PERC 4e/Si. The error message I was receiving was "Windows is unable to install to the selected location." Then when clicking details it gives error 0x80300001.
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