Nobody seems to know why the C:\Windows\Installer directory sometimes spirals out of control.
All I can add is that I’ve seen this kind of behavior. At a previous job, I administered a couple hundred servers. I had web servers, database servers, domain controllers, utility servers, installation servers, and the old web servers which basically served as a playground for the people who had more clout than me.
Everything but the playground servers theoretically started out identical to each other except for the IP address. They were built following the same instructions.
But invariably, one or two servers in each team would suffer from perpetual low disk space. To keep things running, I had a few Red Green-like solutions.
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