Setup fails with 'Access Denied' and you are using Symantec\Norton antivirus

Some users running Symantec\Norton antivirus have reported experiencing an error similar to the following when running the Office Mix installer, OfficeMix.Setup.exe:

    There was a problem starting C:\WINDOWS\Installer\MSI4972.tmp Access is denied

Users who have contacted us through support have had success installing Mix by temporarily disabling their virus scanner to let the install proceed, and  then re-enabling it after installation has completed.

To help avoid this issue, Norton advises that its users ensure their virus definitions are up-to-date.

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