In order to manually update your driver, follow the steps below (the next steps):

... device you wish to update and choose Update Driver Software
3. Choose to select the location of the new driver manually and browse to the folder where you downloaded the driver

About External Web Camera Updates:

Installing the web camera's drivers and utilities will help your system to properly ...
In addition to that, updating the webcam's software could enhance the unit's overall performance, include ... highly recommended to always use the most recent driver version available.

Try to set a system restore point before installing a device driver. This will help if you installed an incorrect or mismatched driver. Problems can arise when your hardware device is too old or not supported any longer.