Sorry Kryptic but don't agree. Having 2 AV programs on a single PC - each will confuse the other. AND, I have to say that with any free software, you get what you pay for. Let's get down to what's gone wrong with Norton. It won't stop working without good reason. Have you had a recent crash? Try running SFC. If nothing then remove Norton completely using Add/remove programs, then make sure that ALL Norton folders are deleted, then re-install from scratch.