Its really annoying when I see a topic "Avast is a virus". There was this same topic name "Avast is a virus" some years ago and it had lots and lots of comments.... Listen Slight0 avast should not be blamed it's your computer that has issues! One of the biggest issues that computer can get infected is that it contains an unlicensed/pirated copy of Windows or some other system problems. All over the world stores do sell pirated/unlicensed copy of Windows, they do this because it's their own business and it's cheap for customers to buy it. I think there's less of these now. I have had experience with these before.
If you can't tell us what are the problems and issues are exactly? We can't help you.