Microsoft Office 2007 SP1 install fails with error 78F

I am writing this in the event someone else encounters this problem installing Microsoft Office 2007 Service Pack 1 (SP1).

I’m running Windows Vista Ultimate x64 and was getting error code 78F whenever I attempted to install this service pack via either Windows Update or running the installer independently.

The solution is even more bizarre than the error: Place any data (i.e., non-music) CD in your computer’s disc drive and try again. You don’t need to actually run anything off the CD, just make sure it contains some files…a Vista or Office 2007 installation CD should work fine. Yes, it really works.

See the screen shot below showing the three failures and final success. Weird.

Office 2007 SP1 - Error 78F - Windows Update

5 Replies to “Microsoft Office 2007 SP1 install fails with error 78F”

  1. Thanks – stumbled across your solution while searching for Microsoft’s – and it worked a treat ! 😛 Just wish I’d not bought this darned laptop with this horrible Vista system on it 😥 – nearly as bad as ME was, IMO ! Any ideas on how to get a ‘modern’ computer ‘downgraded’ to good old XP ? (See what you get for being helpful – just more demands on your expertise ! 😉 )

  2. Glad to see you found the post helpful. The easiest way to downgrade a computer is to find an old XP installation disc and use it. Be careful, most of the large manufacturers (HP, Dell, etc.) license the copy of Windows only for the machine it was purchased with.

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