ERROR 1402

I have removed all Adobe from my computer and shut it down.  Start it back up, go to Adobe website and download Adobe Reader.  It runs through almost the entire process and gets to the last little bit and I get this:
Error 1402 Could not open key
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Optional Components\IMail
Verify that you have sufficient access to that key, or contact your support personnel
It will not complete the install and I can not get any type of PDF program to read on my computer...........
Has anyone encountered this?  Have a fix?

I am logged on to the computer as the Administrator.
Running Windows XP
I do not know how to use the regedit to check the registry key permissions.............how can I find out?
Thank you!

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