An unspecified error with AVG Free Edition 2012

I need help with AVG Anti Virus Free Edition 2012. After turning on my computer, I clicked “Install updates for Windows” then I get an error message from AVG saying: “An unspecified error occurred in AVG. Would you like to send diagnostic data to AVG technical support department for further analysis?” Is AVG 2012 trusted? Or should I not install any Windows update at all? Which one must be the cause?
