BKinvst7 – I’m with the support staff of TradeStation Technologies, and I’d like to help you. A number of our customers are successfully using TradeStation and Avast together. If you go to https://www.tradestation.com/Discussions/Topic.aspx?Topic_ID=92224, you’ll see a thread on our forums that discusses this. If after reading through this you continue to experience problems, please post to our support site and we’ll help you fix it. Many of our customers have found our forums to be a useful resource when seeking assistance specific to TradeStation, and we therefore encourage you to visit our forums and ask questions or contact our technical support line at any time at 800-822-0512.