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I am running Windows XP, SP3, all updates installed.

When I plug in or disconnect a USB device, I get a BSOD:

0000007E or 000000BE

and the two drivers that are listed are either fastfat.sys and kmixer.sys.

I've uninstalled all USB devices in the Device Manager, I'd re-installed my WACOM drivers, all to no avail.

I am not sure how to proceed in debugging this.

Any thoughts?

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Might be useful if you could elaborate on what types of USB devices trigger the error - peripherals, flash drives, external HD, everything, etc? – DMA57361 Aug 13 '10 at 10:32
Sure... USB jump drives, MicroSD cards plugged into USB adapters, SD card plugged into the front media slot, Western Digital 2.5" passport drives, etc. – NinjaCat Aug 16 '10 at 0:32
up vote 1 down vote accepted

Have you tried running the system file checker to verify that all the system drivers are undamaged/unmodified?

The MS Knowledge Base Article on the STOP 0x0000007E error (aka SYSTEM_THREAD_EXCEPTION_NOT_HANDLED) provides some general advice on things to try.
It looks like you've tried a few already, but it's probably worth a look.

I can't find a dedicated article for Stop 0xBE, but the friendly version of the error is ATTEMPTED_WRITE_TO_READONLY_MEMORY, and from what I find its causes can be much wider (bad drivers, bad software, bad hardware, bad BIOS, and so on). So that doesn't helps much.

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Along with DMA57361's suggestion of checking for corrupted system files, the kmixer.sys is a sound driver, you might see if there is an update for your sound driver, also scan your system for malware or a rootkit.

GMER rootkit remover

Sophos rootkit remover

Sysprot rootkit remover

TrendMicro Rootkit Buster

F-Secure rootkit remover

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