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Cleanup Windows Device Manager
in SAFE MODE
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Please NOTE:
This
procedure can ONLY be performed while running Windows in
SAFE MODE
Cleaning Up the Device Manager
while running in Windows Safe Mode is the first step in resolving hardware
conflicts in Windows.
Win9X - The following
procedure can resolve Windows conflicts by removing redundant and/or obsolete
device entries that are installed in virtual mode.
WinXP and 2000 -
Removing USB devices in Safe Mode will force the OS to refresh the USB driver
stack and may cause a shift in IRQ assignment.
Enter
Windows SAFE MODE by holding down the F8 or Ctrl key just before the Windows Graphic
User Interface, (the colored start screen or GUI), displays on the monitor.
If you see the Windows GUI you missed your opportunity and you will need
to cycle through, shutdown and try again.
When
the Start Up Menu appears choose (SAFE MODE)
Windows
will inform you that you are in SAFE MODE.
If you are using a USB mouse you may not have mouse support.
Note:
Completely removing USB creates problems for users who have both USB
keyboard and mouse connected. When you reboot to Windows Standard Mode, NO input device is
recognized making it impossible to continue. To prevent this from
happening, change one input device to PS/2 until you
have completed the cleanup.
Using the TAB, ARROW
keys, CTRL, ALT and ENTER, navigate through START, SETTINGS, and CONTROL PANEL
to SYSTEM
Screen
Shots taken from Win98ME System
Windows
SAFE MODE
Windows
SAFE MODE
Windows
SAFE MODE
TAB
DEVICE MANAGER
Using
the arrow keys, go
to each and every category and remove any and all redundant and/or obsolete
device entries that you find there. Remove
both copies of the duplicate entries. When
you reboot, Windows will recognize the device and reinstall a single driver.
Note: Always reboot to Standard Mode and then recheck the Device
Manager in Safe Mode after adjustments have been made. Windows has a habit
of installing and reinstalling duplicate devices in virtual mode.
Windows
SAFE MODE
Windows
SAFE MODE
Removing
USB Completely
If
USB is sharing an IRQ with another device and you are attempting to free the
IRQ, or you need to refresh the USB driver stack, you must remove ALL USB
elements completely. Windows will
refresh the USB driver stack when you reboot to Windows Standard mode..
Note:
Completely removing USB creates problems for users who have both USB
keyboard and mouse connected. Change one input device to PS/2 until you
have completed the cleanup.
Refreshing the USB Driver Stack
Windows
Standard Mode
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Unplug
all USB devices except keyboard and/or mouse.
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Uninstall
the software for the USB peripheral devices.
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Shutdown
and boot to Safe Mode -> Device Manager
Windows
Safe Mode -> Control Panel -> System Properties -> Device
Manager. In the view Tab Select the Show Hidden Devices Option
The
order of removal must be followed exactly
-
Delete
USB peripheral devices (Scanners, Printers, Cameras etc.)
-
Delete
HID and/or Composite USB (Human Interface Devices)
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Delete
USB Root Hub(s) (Universal Host Controllers)
-
Delete
USB Host Controller(s) (Universal Host Controllers)
Note:
You can Navigate in Safe Mode using the
keyboard Tab, Alt, Crtl and Arrow keys.
The Universal Serial Bus Controller
and Human Interface Device headings
should disappear completely from the Device Manager. Before rebooting to
Windows Standard
Mode, insert the Windows CD into the CDROM drive and
direct Windows to look in, (Example
D: / Win98, where D is the letter of the CDROM drive on your system),
Win9X folder on the CDROM when/if prompted.
UNPLUG ALL USB DEVICES BEFORE
BOOTING TO WINDOWS
USB Does NOT like to share it's IRQ
with another device especially when the user is employing sophisticated USB
peripherals. Even though Windows may report NO conflict, if USB is
sharing its IRQ with another system peripheral, (i.e. video, sound, SCSI etc.), that is
often the source of the problem.
(IRQ Holder for PCI Steering is NOT considered another
device)
Screen
Shots taken from WinME System
USBMan
12/14/2005
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