Based on what you're describing, SB crashed during the loading process. This is something that just about everyone deals with. Some more frequently than others. From what I understand, this is usually driven by a background application, driver, etc. interfering with SB. One thing I noticed you didn't mention was the firewall. If you're using Avast, you're either probably using the Avast Firewall or the Windows Firewall. Which one are you using?