Hello Jim, right click on the rotating ball in your bottom menu bar, a pop-up will appear with several functions on it, click on the top one that says On-Access Protection Control, and then tab through each function - Instant messaging, Network shield, internet mail, etc, etc. Click on terminate and a box will appear and say Persist the Changes ? Press no to apply the changes just for now, whilst you install something. Click on each item you have running and terminate them all, then they will become greyed out. Click OK when you've finished, do whatever you want to do then go back into avast again and switch them all back on again.
Hope that makes sense, I was typing the instructions as I went through the motions......
Cheerz. ex-railwayman.