This sort of thing regularly happens with symantec and mcafee. We repair computers for homes and businesses, and very frequently find computers with antiviruses from "the big boys" which have made systems go wrong one way or another - either internet explorer won't start, internet is slow, or internet not accessible, or in extreme case the computer won't start. And yet people stay with these packages. Why? because they think they have to and don't know any different. We have over 1000 installations with Avast, and haven't had a single problem in over five years. Our customers like Avast so much they recommend it to their friends. Just keep up the excellent work!