Vista Bug Squash: Fix Driver Installation Problems with Class-Compliant Devices

Much of the OS discussion tends to devolve into generalities, philosophical debates, and religious wars. We’re going to try something different: wherever possible, squash the bugs. Here’s a tip for Windows Vista that finally allowed many of my USB devices to work properly.
Many music devices, including simple audio interfaces and (in particular) USB MIDI keyboards, don’t require drivers. These are sometimes called class-compliant devices, as they’re covered by standardized classes that describe what they do. There actually are drivers for them, but they’re provided by the operating system. And that’s a good thing.
Unfortunately, many people have found that Windows Vista has problems finding the drivers for these devices. Here’s a fix that works for me (and, apparently many others):
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