Only five tips left for a secure Christmas, and you can soon win a Christmas gift in this Christmas calendar! Security tip #20 is to remove unnecessary programs or services from your computer. You should make sure that your system only have the minimum required software for your task installed. This is not only due to performance reasons, but the more applications you install, the more attack vectors you leave open for an attacker. Do you really need Adobe Reader on your system, or is using the built in one enough? Most likely, the built in PDF reader is more than enough (and if it isn’t for a certain file, then you should really question the validity of that file).