Let's try to change the security permissions to allow full access to the Shared Documents folder, and then run the common files installer.
Complete one of the following procedures to change the security permissions.
1. Choose Start > Run.
2. Type %allusersprofile% in the Open box, and click OK.
3. Right-click the Shared Documents folder, and choose Properties.
4. Click the Security tab.
5. Select Everyone in Group Or User Names, and then select Allow next to Full Control in the Permissions. (For more information on changing permissions, see Windows Help.)
6. Click Advanced, and select Replace Permission Entries On All Child Objects With Entries Shown Here That Apply To Child Objects.
7. Click OK, click Yes, and then click OK to close the Shared Documents Properties dialog box.
Edit the file permissions for the All Users folder and the Windows\Installer folder by running the CALCS commands. Then, run the common files installer to complete the Adobe Updater utility installation.
To edit file permissions:
1. Choose Start > Run.
2. Type cmd in the Open box, and click OK.
3. Type the following CACLS commands for your operating system exactly as they appear, pressing Enter at the end of each command line:
Important:Enter spaces before and after /T, /E, /C, and /G in each line.
cacls c:\windows\installer /T /E /C /G administrators:F
cacls "c:\documents and settings\all users" /T /E /C /G administrators:F
exit