To solve the issue, disable the UAC and then retry the installation. Do either of the following to disable the UAC:
To disable UAC from the Windows Settings page, do the following:
- Open Control Panel, click System and Security, then click Action Center.
- Select Change User Account Control settings.
- Drag the slider down to the bottom to disable it entirely.
- Restart the machine as prompted.
- Re-install the MSA. You will no longer encounter the error message and should successfully install the MSA.
To disable the UAC from the registry, follow the steps below:
Always back up the whole registry before making any modifications. Incorrect changes to the registry can cause serious system problems.
- Click Start, type "regedit" in the search box, then click regedit.exe.
- Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System.
- On the right pane, look for the EnableLUA registry key.
- Double-click EnableLUA, then change the value to 0. To enable the UAC again, change the value back to 1.
- Restart the machine.
For more information, you can refer to this Microsoft article: Turn User Account Control On or Off.