When users is trying to open PDF file from the internet using browser he gets following error message - Problem (1:1)

SYMPTOMS

When users is trying to open PDF file from the internet using browser he gets following error message:

Title: Adobe PDF Document

Error:

      There is a problem with Adobe Acrobat/Reader.
      If it is running, please exit and try again. (1:1)

      

Simple way to test is to point browser to any online PDF link. 

RESOLUTION

The required registry key is missing or does not have correct permissions set.

1. Login to a server or user's PC that has this problem

2. Open registy editor:

Click Start \ Run
Type regedit and click ok

3. Browse to HKEY_CLASSES_ROOT\Software 

4. Verify if Adobe\Acrobat\Exe key exists.

5. If it exists skip to step 6 otherwise follow inscructions below to create one

5.1 Right click on Software, New, Key
5.2 Type Adobe and hit enter
5.3 Right click on Adobe, New, Key
5.4 Type Acrobat and hit enter
5.5 Right click on Acrobat, New, Key
5.6 Type Exe and hit enter
5.7 Click on Exe and double click on (Default) on the right and
       enter the text below including the quotations:

"C:\Program Files\Adobe\Reader 9.0\Reader\AcroRd32.exe"

* Verify that  the path to AcroRd32.exe is correct 

5. 8 Click OK
5.9 Skip to step 7

6. if exist verify permissions to the key

6.1 Right click on "Adobe" and click "Permissions..."
6.2 Make sure "Autenticated Users" account is listed and has "Read" permissions set to "Allow"
6.3 If "Autenticated Users" is not listed :

6.3.1 Click "Add..."
6.3.2 Type "Auth" in the field and click "Check Names"
6.3.3 Click OK after "Authenticated Users" name shows in the field.
6.3.4 Select ""Autenticated Users" in the "Groups or user names:" field
6.3.5 Check box for "Read" permissions in the "Allow" column
6.3.6 Click "Advanced" button
6.3.7 Check "Replace permissions entries on all child objects..."
6.3.8 Click OK to propagate changes to the object below.

7. Get a beer :)