Office 2007 Compatibility Pack stopped working

[Rick]

We are still running Office XP, (I know...I know). I've installed the
office 2007 compatibility pack on all the computers in the office.
Initially it worked fine but it has stopped working on several
machines. On those machines I no longer get the full list of items to
convert when double-clicking on a .DOCX file. Most importantly the
Word 2007 convert option is no longer listed.

I don't get the message as if the compatibility pack is not installed,
there is just no option listed in the convert menu. In fact if I just
open Word and drag-n-drop a .DOCX file into word it converts and opens
just fine. It simply will not work if I use the FILE-OPEN function.

Here is what I've tried:

1. Uninstall the compatibility pack
2. Download and reinstall the newest version of the compatibility
pack.

Still nothing!

I don't know why this is happening to more and more of our computers.
The only fix I can find is to uninstall Office XP and the
compatibility pack and then reinstall both. Seems like there should
be a quicker fix.

Any suggestions...I can't seem to find any help on the web.