Been there, tried it, no good. However, here is what DID work. I found this solution in the Adobe READER forum:
Create a text file (wordpad or notepad) with the following lines (copy and paste). Make sure the file has a .reg extension and not .txt or doc - you may have to rename from a command window. Once the file has the proper extension, simply double click on it and the entries will be made to your rgistry. Close and reopen IE and it will work fine.
----- COPY STARTING WITH NEXT LINE -----
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\Software\Adobe]
[HKEY_CLASSES_ROOT\Software\Adobe\Acrobat]
[HKEY_CLASSES_ROOT\Software\Adobe\Acrobat\Exe]
@="\"C:\\Program Files\\Adobe\\Acrobat 6.0\\Reader\\AcroRd32.exe\""