Go to the last tab on the right. Look at all the programs listed there. Some will be obvious what they do, others won't. For those you can't identify, plug them into the search engine on this website: http://www.sysinfo.org/startuplist.php
Turn off the ones you don't want. Hit okay. Restart. Windows will probably complain that you did something when you boot back up, but just hit the "Ignore" checkbox on the message when it comes up, and relax.