Start Menu > Run
regsvr32 /s "C:\Program Files (x86)\Adobe\Acrobat 10.0\PDFMaker\Office\PDFMOfficeAddin.dll"
<ENTER>
Then again
Start Menu > Run
regsvr32 /s "C:\Program Files (x86)\Adobe\Acrobat 10.0\PDFMaker\Common\AdobePDFMakerX.dll"
<ENTER>
The above codes, will re-register the adobe dll files needed to convert ms office files.
They will not cause any damage by re-registering again....so give it a go.