Getting Rid of Unknown USB Device

  23790954 13:28 04 May 2009

Hello again to all you good forum members.
I again require the excellent assistance of you computer specialists, with a problem which has just arisen on my system.
I have used my front USB ports successfully with various accessories, for a year or two.
Last week I decided to remove the devices from the front USB ports, as they were no longer required. Now, although there are NO USB devices connected to the front USB ports, as soon as I boot up my computer, a warning comes on the monitor, showing the fork type icon in the bottom right tool tray, stating that the USB device is NOT recognised, and to click on the fork icon to view. When clicking on the fork icon, it just reveals that it is an UNKNOWN DEVICE. I can of course disable it in device manager, but as soon as I reboot the system it reappears. They only way I can stop the system picking up this UNKNOWN DEVICE is to disconnect my front USB ports from the motherboard, which I have tried and proved successful. However this means I have to reconnect them every time I wish to use them.
I have formatted the hard drive, and reinstalled all the programmes etc., and I have replaced various devices in the front USB ports, then used the uninstalling device of Windows XP PRO before removing them. Again this proved useless, as the warning still appears every time I boot up the system. The UNKNOWN DEVICE is shown in the device manager, and can be found by hardware installation manager, but nothing can be done with it. Has anyone else ever had this problem, and is there a way to rectify it.
All suggestions to this problem would be very much appreciated.

  Graphicool1 15:05 04 May 2009

Your PC may contain a hidden 'Card Reader' that you are unaware of... click here and click here

  Fruit Bat /\0/\ 15:06 04 May 2009

click here USBDEVIEW

lists all devices you have plugged in to your ports.

Info and tutorial click here

If you set the DEVMGR_SHOW_NONPRESENT_DEVICES environment variable, Device Manager will show you the "ghosts" of past devices that are no longer connected to your system (or in the case of USB devices, were perhaps attached to a different USB jack) if you enable Show Hidden Devices. From there, you can right-click and uninstall all these non-present devices. (Don't worry, the OS will detect and reinstall the drivers automatically when devices are reconnected.)

  Fruit Bat /\0/\ 15:07 04 May 2009

Removing USB Windows Registry Keys for Windows XP users.


Log into Windows as Administrator (or a user with Administrator rights).
Make a backup of the registry in case of undesired results caused by the changes.

1. To begin, click on "Start" and then "Run" to display the "Run" dialog box.
2. In the "Open" input box, type in "regedit" (without the quotes), then press "OK."
3. Pull down the "Registry" menu at the top of the window and select "Export Registry File..."
4. Type a name identifying the backup (e.g. today's date) and navigate to a folder where you would like to save it.
5. Make sure that "All" is marked under the section titled "Export range."
6. Click on the "Save" button, and when the hourglass (wait) cursor disappears, the backup will be saved.


7. In Registry Editor's left-hand pane you will see the "My Computer"object and then several yellow folders

8. If any of the folders have a dash or minus sign (–) to their left, click on the minus sign to retract the subfolders.
9. Click on the plus sign (+) next to each of the following folders to display the subfolders it contains:
HKEY_LOCAL_MACHINE, then SYSTEM, then CurrentControlSet, then Enum
10. The two subfolders beneath "Enum" of concern here are: USB and USBSTOR.
11. Right-click the "USB" folder and select "Permissions" to allow modifications to this folder.
12. In the resulting dialog box, highlight the user group called "Everyone."
13. Place a check mark in the "Full Control" box (Allow column), then press "OK" to apply the permissions

14. Repeat step 11-12 for the USBSTOR folder. Do not modify the USBPRINT folder.


15. Right-click on the USBSTOR folder, and click Delete.
16. Windows will warn you about the delete request, press "OK" to confirm the deletion was intended.
17. Repeat step 15-16 with the USB folder.

NOTE: If you have a USB keyboard and/or mouse, one or both input devices may stop working temporarily after

the last step was completed. If this happens, turn off your computer with the "soft" power switch, and after waiting

10-15 seconds after the machine shuts off, turn the power on again.

18. Close the Registry Editor window.


19. Unplug any unnecessary peripheral connected to the computer USB ports.
20. Click on "Start," then "Turn Off Computer" and then select the "Restart" option.
21. During the boot process, Windows will redetect the USB hardware and will reinstall device drivers

22. The essential registry information will be recreated, and will now only store information for devices connected

from this point forward.
23. Power on your USB product and attach it to one of the computer's USB ports. Windows will begin detecting

the "new" hardware and will install the necessary drivers to support it automatically.

  23790954 16:37 04 May 2009

Fruit Bat,
May I compliment you on your computer knowledge, you are a credit to this forum.
Carried out instructions with perfect results.
Also printed out instructions which I will file for future reference.
Many, many thanks.

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