Reinstall USB controllers
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Use the Mouse
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First, please disconnect all USB devices and then perform the following steps:
1. Click "Start" button, type “devmgmt.msc” (without quotation marks) in the “Search” bar and press "Enter". Click “Continue” if necessary.
2. In Device Manager, double click to expand "Universal Serial Bus controllers", right click on the Host Controller, click "Uninstall" and click "OK".
3. Repeat the step 2 to uninstall all items under "Universal Serial Bus controllers".
Then, restart your computer and Windows 7 will reinstall all USB controllers automatically.
Use the Keyboard
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First, please disconnect all USB devices. Then, go through the following steps:
1. Press "Ctrl + Esc" to open the “Start” menu.
2. Type “devmgmt.msc” in the Search bar and press "Enter". Click “Continue” if necessary.
3. In Device Manger, press Tab and use "Up" and "Down" to move the highlight to "Universal Serial Bus Controllers".
4. Press "Right" and expand it.
5. Press "Down" to move to the first item and press "Delete" to remove it.
6. Repeat the step 5 and uninstall all items under "Universal Serial Bus Controllers".
Then, restart your computer and Windows 7 will reinstall all controllers automatically.