Today, I was thinking about it, and got tired of the slowdowns and other problems, so I downloaded and ran Malwarebytes. I've scanned with Norton Security Suite regularly, and rarely found a problem. I've had Norton Security Suite installed on my computer since purchasing it, mostly because it came free with my computer, and I also get a free subscription through Comcast. I've been recently having problems with slowdowns, lockups, keyboard malfunctioning, and general weirdness.