adobe acrobat pro 9.0 will not merge xls files, but will merge xlsx files

I just upgraded my user from Office 2003 to Office 2007.  Prior to the upgrade, she was able to merge *.xls and *.xlsx files using acrobat 9.0 pro.  Since the upgrade to 2007, acrobat will only allow her to merge *.xlsx files.  She needs to be able to merge both versions without having to go through the process of coverting all the *.xls to *.xlsx.
WilliamsServiceCenterAsked:
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Berkson WeinTech FreelancerCommented:
Is there an error message when she tries to merge xls files?
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WilliamsServiceCenterAuthor Commented:
She receives the following errors after she clicks on combine files:

"No PDF file was created because Acrobat encountered an unidentified error."
"Missing PDFMaker files.  Do you want to run the installer in repair mode?"

She has run the installer and still gets these same two errors.
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Berkson WeinTech FreelancerCommented:
Hmm.
Did you upgrade to Office 2007, or did you add Office 2007, leaving Office 2003 installed as well.  Either way should work, just trying to understand the setup to offer more suggestions.
If she double clicks on an xls file in explorer, does it open in excel 2003 or 2007?
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WilliamsServiceCenterAuthor Commented:
We upgraded to Office 2007.  Did not uninstall Office2003, but overwrote it to 2007.
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WilliamsServiceCenterAuthor Commented:
also, when she opens xls files in explorer, they open correctly in office 2007 as an xls
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WilliamsServiceCenterAuthor Commented:
reinstalled acrobat.
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