startup programmes

My desktop is taking too long to boot and I’m suspecting that my startup programmes are many.
What programmes should I remove and which ones should I not.I have such programmes as:-
-Accessories
-internet explorer
-mouseware
-startup
-Winamp-Winzip
-Microsoft binder
-Microsoftoutlook
-windows Explrer
-windows
-windows media player
…….etc….

I need your help so that I don’t remove those that are necessary for start up.
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