Go to the control panel of your computer from the start menu.
When there, search for "programs."
There should be a result that says "Add or Remove Programs," or "Add/Remove Programs," depending on what type of computer you have.
Click on that, wait for all the programs to load before clicking on the Privitize VPN toolbar, then click "uninstall."
As for resetting your search system, if it's been tampered with (mine had), click on the three horizontal bars on the top right hand corner of the chrome page itself, click on settings, then go down to "search" and reset it.
I...hope that makes sense.