Many of our users can't open PDFs. We have to select Reader as the Default PDF Handler once a day.

What was once an infrequent problem, has become a chronic issue since some changes were made to Group Policy by an AD admin. We've disabled all the GPs that pertain to Acrobat, but we're still having to log into users' workstations to remind Acrobat Reader that it is the Default PDF Handler (as found under Edit>Preferences>General.)
As I mentioned above, this used to happen occassionally, and I'm not really sure why. We use versions 9.5, X and XI, and all of them have exhibited this problem in the past and currently. If we could find a network-wide solution to this issue (rather than having to log into scores of individual workstations every day), we would be really happy.
Any ideas?
Thanks!

We think we've found the answer. Apparently, an admin from six years ago had created an ironically named batch file called "Adobe Fix.bat" which called a login script to put the following registry key on every computer:
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\SOFTWARE\Adobe\Acrobat\Exe]
@="\"C:\\Program Files\\Adobe\\Reader 8.0\\Reader\\AcroRd32.exe\""
Since C:\\Program Files\\Adobe\\Reader 8.0\\Reader\\AcroRd32.exe doesn't exist on any computer anymore, no PDFs would load until you told Acrobat what software to use to open them.
Removing this script should fix the problem.

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