end explorer.exe ;)
For awhile I had to do that and restart it to get my battery life to show up.
Closing them in the task manager will only work until the next restart, then you will have to do it again.
To completely stop something from starting up you:
1. Start menu 2. Run 3. type msconfig 4. Figure out what could be stopped in the "Services" and "Startup" tabs.
Pure and simple goto add/remove programmes and remove anything you don't use. Leave the rest well alone unless you know what you are doing. Yes, you could google the process names but my guess is knowing what it is and does will not help you decide if you need it.
Your computer will not speed up very much, you don't need to do this.