(Fix) 'Another Installation is Already In Progress' installing Office 2007 over Office 2000

Ran into an interesting problem this evening – I was helping someone who was having problems with installing Office 2007 on an XP system with Office 2000 (I believe Professional) installed. The problem was that when the actual installation process started, it would hang up because another installation was running.

The standard fix for that is restarting the system to let the in-progress installation do the processing that it needs a system restart for, but in this case that wasn’t the issue.

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