Most modern programs have an option where you can select to load at Windows Startup. Use that option if it has it to stop it loading up then.
It only stands to reason the less you have loading at startup the quicker the system will load up.
I have read that your PC will start up faster by deleting applications from the start up menu. Does this have any effect on the programs or does it just disable them from starting at boot up ? My system operates using Windows XP