The only things I use on msconfig are me firewall, spyware detector, and Anti-virus,
You can most likely disable all other entries such as
WSShedulder
Freebar
Vonage
PowerMenu.
I can't advise about the Microsoft entry as I can't see the path.
Try disabling these entries, make sure the programs still work and you can keep them unchecked.
However, on running some programs, they automatically re-insert the command in msconfig.