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Sometimes that isn't even enough. Windows for example ships with a feature called the "Windows Platform Binary Table" that will load and run DLLs embedded in a machine's ACPI tables.

Wow. Didn't know that existed. Hard to see what legitimate, user-serving purpose that would serve. Or at least how the good of it's inclusion would outweigh possible harms.

Is there software that will enumerate ACPI for DLLs?

You can look for ACPI table(s) called "WPBT" using RWEverything (if you are a Windows user): http://rweverything.com/downloads/RwPortableX64V1.7.zip

or look into the following filesystem path in Linux: /sys/firmware/acpi/tables

If you want to stay clean, nuke the drive and install linux instead

Only good option is nuke the Windows and use the better OS, like GNU/Linux, FreeBSD or OpenBSD etc.