Not really a question but noting it here and planning to open a bug report about this (*Edit* opened as SR# 1134437591). I was in my XP SP3 VM, no USB devices attached to host or guest. I was connected to a remote machine over VPN+RDP. All of a sudden I got a Windows BSOD for no apparent reason. This is an XP SP3 VM not upgraded to the latest virtual hardware. The error message was USB_BugCheck in usbport.sys

Microsoft (R) Windows Debugger Version 6.9.0003.113 X86
Copyright (c) Microsoft Corporation. All rights reserved.

Loading Dump File C:\WINDOWS\Minidump\Mini090108-01.dmp
Mini Kernel Dump File: Only registers and stack trace are available

Symbol search path is: *** Invalid ***
****************************************************************************

• Symbol loading may be unreliable without a symbol search path. *
• Use .symfix to have the debugger choose a symbol path. *
• After setting your symbol path, use .reload to refresh symbol locations. *

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Executable search path is:
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• Symbols can not be loaded because symbol path is not initialized. *
• *
• The Symbol Path can be set by: *
• using the _NT_SYMBOL_PATH environment variable. *
• using the -y <symbol_path> argument when starting the debugger. *
• using .sympath and .sympath+ *

*********************************************************************
Unable to load image ntoskrnl.exe, Win32 error 0n2

• WARNING: Unable to verify timestamp for ntoskrnl.exe
• ERROR: Module load completed but symbols could not be loaded for ntoskrnl.exe

Windows XP Kernel Version 2600 (Service Pack 3) UP Free x86 compatible
Product: WinNt, suite: TerminalServer SingleUserTS
Kernel base = 0x804d7000 PsLoadedModuleList = 0x8055d720
Debug session time: Mon Sep 1 07:42:49.838 2008 (GMT-5)
System Uptime: 1 days 4:00:43.609
*********************************************************************

• Symbols can not be loaded because symbol path is not initialized. *
• *
• The Symbol Path can be set by: *
• using the _NT_SYMBOL_PATH environment variable. *
• using the -y <symbol_path> argument when starting the debugger. *
• using .sympath and .sympath+ *

*********************************************************************
Unable to load image ntoskrnl.exe, Win32 error 0n2

• WARNING: Unable to verify timestamp for ntoskrnl.exe
• ERROR: Module load completed but symbols could not be loaded for ntoskrnl.exe

Loading Kernel Symbols
................................................................................................................................
Loading User Symbols
Loading unloaded module list
.............
Unable to load image USBPORT.SYS, Win32 error 0n2

• WARNING: Unable to verify timestamp for USBPORT.SYS
• ERROR: Module load completed but symbols could not be loaded for USBPORT.SYS

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• *
• Bugcheck Analysis *
• *

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Use !analyze -v to get detailed debugging information.

BugCheck FE, {5, 82ac00e0, 80867112, 82c83e08}