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If you decide to take advantage of the free trial, woe be unto you when the trial ends. The makers of antivirus software have an army of designers, an endless supply of blood-red pixels, and copywriters skilled in the art of scaring the crap out of you.
Here are two examples I saw on a Sony notebook after the Norton trial ended. (A later dialog box included a "Stay Unprotected" option. Classic!) Notice again that there's no way to make the warnings stop. With persistence, you can hide the current warning, but there's no information on how to uninstall the expired program and replace it with something else.