Unsigned drivers can cause malfunctions of the system.

In Microsoft Windows Vista and Microsoft Windows 7 by default, installing an unsigned driver is blocked. However, it can temporarily disable the driver signature verification to allow installation of unsigned driver.

1) Disable signature verification of drivers in Windows 7 :

Press Windows key + R from keyboard to  launch run window; type ”bcdedit {backslash} set nointegritychecks ON”
(replace {backslash} with the backslash sign and type without quotation marks like the screenshot below) and click OK:

Apparently, nothing will happen. Restart the PC.
The unsigned driver now can be installed.

2) Re-enable signature verification of drivers in Windows 7 :

It is strongly recommended to do a re-verification of the signatures of the drivers.

Press Windows key + R from keyboard to  launch run window; type “bcdedit {backslash} set nointegritychecks OFF”
(replace {backslash} with the backslash sign and type without quotation marks like the screenshot below) and click OK:

Restart the PC.

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