How to Disable Startup Programs in Windows?

If your PC is taking too long to boot, it’s probably because you have far too many programs running at startup.Reducing this is easy, it will make your PC launch noticeably faster and lighter upon first load.

Disabling Startup Programs in Windows 7, Vista, or XP

go to Run( Windows key + R)
type "msconfig."
select the Startup tab.
disable non necessary programmes
                                            
 Try to make sure you research what you are turning off as some processes might be needed by third party programs or drivers you have installed.

Disabling Startup Programs in Windows 8 or 8.1 or 10

ctrl+shift+delete
start taskmanager 
click startup
disable non necessary programmes