hmm very odd....How was your Adobe Acrobat Reader installed? .msp files are a kind of installer package file, I think. You'd normally use them if you were installing the application from a command line. I guess it could be a patch file, if you've updated from an earlier verison of AAR, in which case your system is looking for the install source when it's trying to make any changes to the existing install. If this is the case you might not be able to do the following!
Now assuming you're running Windows you should be able to go into control panel and then add/remove programs and select Adobe Acrobat Reader. You're then given the option to rerun the install routine and run a repair on the install. This should replace any mmissing files. You should also find the original setup files and data cab files in the following location:-
C:\Program Files\Adobe\Acrobat 7.0\Setup Files\RdrBig708\ENU
or something similar!
You can rerun the setup from there also by running the nicely named setup.exe file!

You could also try renaming the folder that AAR is installed into then download and install the latest version from the adobe website. If that works then you should be able to delete the renamed folder.
Rename this folder
C:\Program Files\Adobe\Acrobat 7.0\
to something like
C:\Program Files\Adobe\Acrobat_old

See how you get on with that.

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