compatibilty pack fails to open .xlsm file

We are currently using Office 2003 and have installed the MS Office 2007 Compatibilty pack. I have one user however that when we try to open a .xlsm file we get a message that the file converter failed. I have successfully opened the file on several simiarlily configured machines, both desktops and latops, the machine in question is a laptop. I have uninstalled & reinstalled the converter pack, office itself, downloaded and installed all updates. Any Hints, Tricks, Suggestions??
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If it's the exact same config as other machines... I hate to say it but a reimage may be your only option.  

Before you do that you may want to uninstall / reinstall addins but if you've done all that there really doesn't seem to be any other options.  Also have you tried using a different user account on the computer?  The issue may be tied to the user profile.
A20markAuthor Commented:
That's the conclusion I'm coming to also, I tried it with a different account etc.

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