The Behavior Shield turning off is a known problem which Avast will, we hope, fix.
You could try to start it manually, or reboot (again).
MSI78B1.TMP would appear to be a temporary file used by the installer, and if you view it you might see something that would indicate what program it is related to. It is possible that it was the Java update, and that it installed despite Avast blocking the file. You could check the version of Java to make sure you really have the latest version.