USB DEVICE NOT RECOGNISED

THE PROBLEM: "Usb device not recognized"

POSSIBLE Cause:
I. you plugged/unplugged instantly your usb into another machine.

II. you plugged another usb onto your machine thus automatically installing the latters drivers.

III. connection from the usb hub has been fumbled with.

IV. electronic currents thus some minor shot circuits

1.First try plugging your usb into another machine... does it show/ is it o.k? if yes, problem may be the port of your machine. if no, problem may be with your usb...

2.Sometimes the USB ports located on the front of the case don’t have enough power for some USB devices. plug the flash drive into one of the USB ports in the back.

3. Try downgrade all your USB port from 2.0 down to 1.1, you can do that in your BIOS Some USB 2.0 device are not backward compatible with USB 1.1 ports. Try plugging in with USB 1.1 and 2.0 port

Incase of no success try extensive solutions below!!

A.Remove Hidden Devices

make sure you are the administrator/ you have administrator rights

1. Go to command prompt..i.e Click Start. Click Run. Type cmd and press OK/enter.
2. Type set DEVMGR_SHOW_DETAILS=1 press Enter.
3. Type set DEVMGR_SHOW_NONPRESENT_DEVICES=1press Enter.
4. Type start devmgmt.msc” press Enter.
5. Click View. Click Show hidden devices.
6. Click “+” to expand Imaging devices, Unknown devices and USB devices.
7. If there are there any USB devices and unknown devices, please right click it and click Uninstall.

.

Your Problem: Usb device not recognized and above solution din't work for you:

B) Remove all oem*.inf files =
I. Go to command prompt..i.e Click Start. Click Run. Type cmd and press OK/enter II. type cd \windows\inf
ren infcache.1 *.old
ren oem*.inf *.old del C:\windows\setupapi.log

C ) Removing all entries under HKEY_LOCAL_MACHINE/Enum/USB that start with VID ==
Removing the VID entries from the registry will cause them to be redetected at restart.
CAUTION: If you have a USB keyboard or mouse, do not remove the VID entry for these devices, otherwise, Windows may not restart correctly.
1. Click Start and click Run. Type regedit and click OK. The Registry Editor window will open.
2. Go to HKEY_LOCAL_MACHINE\System\CurrentControlSet\Enum\USB.
3. Highlight and delete all the VID_…. entries.
Permissions may be set allowing the deletion of the VID_ entries by following the steps below:
a)Right-click the key to be deleted, and then click Permissions. The VID_… Permissions window will open.
b)With Everyone highlighted in the Group or User name section, select Full Control in the Permissions section.
c)Click Apply, and then click OK.
4. Turn off the computer.

Reconnect the USB device to the computer system,
1. With the computer system turned off, reconnect the USB hub to the the USB port.
2.Restart the computer.
3.A New Hardware Detected window should open and reload the drivers.

1. Click Start, click Run, type devmgmt.msc, and then click OK.
2. Double-click the type of device that you want to update.
3. Double-click the specific device that you want to update.
4. Click the Driver tab, and then click Update Driver.
5. Follow the instructions in the Hardware Update Wizard.
6. Repeat steps 2 through 5 for each USB device.

To install USB 2.0 controller drivers
Before completing this procedure, determine if the USB 2.0 controller drivers you have on your computer are installed. To determine this, do the following:

Open Computer Management. 
In the console tree, click Device Manager. 
Where?

Computer Management 
System Tools 
Device Manager 
On the View menu, click Devices by type. 
In the details pane, click the plus sign to the left of Universal Serial Bus controllers. 
If the word "Enhanced" is included in any of the listed controllers, your computer has USB 2.0 controller drivers installed.

If you cannot find the word "Enhanced" in any of the listed controllers, perform the following procedure:

Stop using any USB devices (such as a printer or Web cam) except the mouse and keyboard. 
In the details pane, click the plus sign to the left of Other devices. Then, under Other devices right-click Universal Serial Bus (USB) Controller, and then click Update Driver. 
Follow the steps in the Hardware Update Wizard to complete the procedure. When you are finished, you might be prompted to restart your computer. 
Notes

To open Computer Management, click Start, and then click Control Panel. Click Performance and Maintenance, click Administrative Tools, and then double-click Computer Management. 
If Universal Serial Bus (USB) Controller is not listed under Other devices, you cannot install a USB 2.0 driver. To find out more about installing these drivers, contact the manufacturer of your computer.