For example, in the path c:\Windows\system32\Macromed\Flash\FlashPlayerTrust\AcrobatConnect.cfg the parent folder is FlashPlayerTrust. The parent folder in your error message could be different.
When you install an Adobe Creative Suite 4, 5, or 5.5 product; Adobe Acrobat; or Adobe Reader, error 1321 or error 1309 appears in the installation log file. It appears along with a message such as the following:
Important: The path ...\Macromed\Flash\FlashPlayerTrust\AcrobatConnect.cfg used above is an example. The specific path and file mentioned in your log could be different.
The Adobe Creative Suite installer attempts to write numerous files to the system. The 1321 or 1309 error occurs when the installer is unable to write a file due to a permissions issue or system error. To resolve error 1321 or 1309, update the privileges on the parent folder of the file or source listed in the error message. The parent folder is the folder that contains the file at the end of the directory string.
In Group Or User Names, select System (1). Then, in Permissions For System, make sure that Full Control is set to Allow (2).
Still in the Security tab (1), click Advanced (2).
In the Advanced Security Settings window, make sure you're in the Permissions tab.
Select Replace Permission Entries On All Child Objects With Entries Shown Here That Apply To Child Objects (1) and click OK (2).
Click OK to close the Properties window.
Important: Before you start, make sure you can see hidden files in the operating system. See Show hidden files on the Microsoft support website.
In the Advanced Security Settings window, select the Owner tab (1) and click Edit (2).
In the Change Owner To area, select the Administrators group (1) and then select the option Replace Owner On Subcontainers And Objects (2). Click OK (3).
If a security warning or window appears, click Yes to continue.
Click OK to close the Advanced Security Settings window and click OK to close the Properties window.
Repeat steps 1 through 3.
In the Advanced Security Settings window, select the Permissions tab (1) and click Edit (2).
Verify that the Permission column for System and Administrators is set to Full Control. If permissions are not set to Full Control, do the following:
Deselect Include Inheritable Permissions From This Object's Parent and click Apply.
It's likely that you encounter a few windows to confirm that action. Copy the permissions and accept any security warnings.
Select Full Control and click OK.
Select Replace All Existing Inheritable Permissions On All Descendents With Inheritable Permissions From This Object (1) and then click OK (2).
Click OK to close the Advanced Security Settings window and OK again to close the Properties window.
Reinstall your Adobe product.