While trying to install Office 2007 I kept getting an error saying "The windows installer service cannot update one or more protected windows files." After searching Microsoft.com I came up with nothing and had to turn to alltheweb.com. Luckily I found a fix.
1. From 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.
2. Find fp4Autl.dll in the list
3. Double click and select extract to c:\program files\common files\microsoft shared\web server extensions\40\bin
4. Restart the 2007 office install
