Wilbertnl, I make some shots:

  1. Try Startup Delayer to control the sequence and the time you want your programs to start up. Choose the best sequence for you! (http://www.r2.com.au).

  2. Check the option ‘Show detailed information…’ into the Advanced tab of the Standard Shield settings. You will see ‘what’ avast is doing… After that you can disable that option.

  3. Could be some new issue of SP2?