Thanks to Petri.co.il
1. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Setup
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Highlight the Setup folder.
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On the right pane, locate the SourcePath.
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Double-click the SourcePath and replace the drive letter in the box to C:\ (if you copied the files to your C:\ drive). Make sure it’s C:\ and not C:\i386.
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Close the registry editor.
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If the system ever needs files from the i386 folder, it will automatically look in the C:\i386 folder.