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一般問題

問題
USB port may stop working after removing or inserting a USB device, how to fix it?

答案

To fix this problem, please the following methods in the order in which Microsoft website are listed below. After each method, check the USB device to see whether the problem is fixed. If the problem is not fixed, try the next method.

This article also includes a workaround that you can try if these methods do not work.
(Microsoft Fix it 50052)

http://support.microsoft.com/kb/817900/en-us