Xoá các thiết bị USB ẩn

Bài viết này cũng có thể áp dụng với những lỗi của các thiết bị như máy in hoặc chipcode.

1. Unplug all USB devices except mouse and keyboard.

2. Click on Start orb,  Type Advanced System settings in the search box and Click on View Advanced System Settings to go there.

3. Click on Advanced tab, Click on Environment Variables.

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4. Under the window „System variables“ Click on New.

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5. Type devmgr_show_nonpresent_devices as the variable name and type 1 as the value.

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6. Click OK 3 times to close the windows.

7. Click on Start orb,  Type Device Manager in the search box and Click on Device Manager in the list to go there.

8. Click on View, then Show hidden devices.

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9. You will now notice that you have a list of USB devices and that some lines appear to be faded. Uninstall all the faded entries.

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The INFCACHE.1 file is used to store information about USB drivers, the information in this file may have become corrupted and may cause windows to load the wrong driver or cause a driver not found message to be generated.
Deleting this file will force windows to generate a new INFCACHE.1 file.

1. Right Click on Start orb  and Click on Open Windows Explorer.

2. Select Computer in the navigation pane, and search for INFCACHE.1

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3. Right Click on the file INFCACHE.1 (if you have more instances of Windows installed only do this for INFCACHE.1 C:\Windows\System32\Driver Store)

4. Click on Properties, Click on Security tab, Click on Edit, Click on Add.

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5. Type Administrators in the window with the blinking cursor, Click OK.

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6. Delete the INFCACHE.1 file.

7. Connect a USB device, but not the one you were having trouble with this will make a new INFCACHE.1

8. New Start the PC and try your device again.

NOTE… It may, in a few cases be necessary to go through this Tutorial two or even three times to get this to work.

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