de-install it, and put on the free Microsoft Security Essentials. My father is as non-technical as they come and when he got his new PC, I put MSE on it. It is totally transparent, light on system resources, auto updates silently an - according to testing - has a good detection capacity.
Although MSE is meant to also be good for spyware, I would be tempted to team it up with free SpywareBlaster. Do that and she's good to go (although she will need to know the 3-click sequence to update SpywareBlaster from time to time)