How to enable and disable USB port in Windows 7

1. If you have not ever already done so, you must connect a USB storage device (ex: USB flash drive) to the computer now, and wait until Windows installs it and displays it in the Computer window with an assigned drive letter, then disconnect it.
NOTE: This only needs to be done once with any USB storage device.

2. Press the Windows + R keys to open the Run dialog, type regedit, and press Enter.
3. If prompted by UAC, then click/tap on Continue (Vista) or Yes (Windows 7/8).
4. In regedit, navigate to the location below. (see screenshot below)

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\USBSTOR

5. To Enable USB Storage Devices in Windows
NOTE: This is the default setting.

A) In the right pane of USBSTOR, double click/tap on Start to modify it. (see screenshot below step 4)
B) Type in 3, click/tap on OK, and go to step 7 below. (see screenshot below)

6. To Disable USB Storage Devices in Windows

A) In the right pane of USBSTOR, double click/tap on Start to modify it. (see screenshot below step 4)
B) Type in 4, click/tap on OK, and go to step 7 below. (see screenshot below step 5B)

7. Close regedit.

THAT’S ALL…!