Hi,
Please find the following link; -
http://windows.microsoft.com/en-gb/windows7/windows-7-windows-server-2008-r2-service-pack-1-sp1-installation-error-0x800F0A12
"If you receive error "0x800F0A12" when trying to install Service Pack 1 (SP1) for
Windows 7 or Windows Server 2008 R2, it means the installer can’t access the system partition of your computer’s hard disk to update files."
I hope this helps,
Kind Regards,
Kieran.
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