It depend on a number of factors including how many programs you allow to run at start up and the number of user accounts on the PC.
For example, we have 4 users on this PC.
If only one of us is logged in we have 41 running process.
If all 4 of us are logged in, that jumps to 63.
To disable some background processes go to Start; Run and type msconfig. Click OK. Then have a look under the Startup tab.
This will help you decide which process can safely be disabled or not click here