Msconfig is Windows startup utlitiy which controls which applications / services are started up while windows is loading. There are many unwanted startup items which you will not need, and these are the cause of slow startup times for Windows.
This simple video shows you how to remove unwanted statup items.
Remember, only startup items such as Firewalls, Virus scanners, windows systems files and any other required item. Items such as e.g. Itunes, are not necessary for startup.