Office 2007 Installation Error
“The windows installer service cannot update one or more protected windows files”
- From the Windows install disk, or c:\i386 that may have been set up in an OEM install, open (double-click) on the FP40EXT.CAB file. It should open.
- Find fp4ault.dll in the archive
- Double-click and extract to C:\Program Files\Common Files\Microsoft Shared\web server extensions\40\bin
- Restart the Office 2007 installer
Credit: http://forums.techarena.in/office-setup/627360.htm#post3224014