Unfortunately I don't know enough about deployment to help there but what I do know is that having more than one Acrobat product (Acrobat, Reader...etc) is not a supported nor recommended setup. The symptoms you describe match the symptoms that most users in here descibe when both products are installed.
To make a long story short, I have never seen a definitive solution in here or anywhere else for that matter.
Appreciate the reply. Of course the problem is that if you have Acrobat full 7 or 8 installed, there is no easy way to deploy updates (if users aren't Administrators) that I know of, and that's if updates are still available for that version - of course Adobe would simply say to upgrade, but it's difficult to justify the cost when the product still works.
Sadly Adobe don't seem to make anything like Microsoft's WSUS to aid in detecting where updates are required, and in deploying them so it seems (happy to be pointed somewhere that shows I have the wrong end of the stick) that short of all manner of home-brew batch files or expensive commercial patch deployment software, that there is no simple way to just say "Patch all my Adobe installations".
I believe Acrobat 8 is still being patched for security issues. I'm not sure about Acrobat 7. I think Acrobat 7 was recently put on end of life status.
The last Acrobat patch for 8.x was 2/16/2010
For Acrobat 7.x it was 10/13/2009