Some are not necessary - eg messages from IBM
nor \Sonic\Update Manager\sgtray.exe
Others I am not sure of. Why not disable one or two at a time and restart. Then after a few hours use, you can tell if they are needed. Some will just add functionality that you will not miss anyway; others may be integral to the full running of the machine. None, however, should prevent it from starting and running.
Trial and error may be the only way.