I was prompted by Avast! to update to version 131229-0 on 30th December. The update did not appear to complete – it hung at the final 'Launching executable file: AvastEmUpdater.exe/updater' stage. However, Avast! states everything is in order. Nevertheless, my Action Center informs me I should update spyware and virus protection and the progress bar remains in its hung position when I view Avast!/Settings/Update. What should I do?