Using Task manager to stop a program running will NOT stop it from starting when you next boot up.
A simple way to control what starts when you boot up is to download and install
Ccleaner
When installing be careful because it tries to install Yahoo toolbar, by default, the install box is ticked, just untick it and procede.
When open, go to Tools -> Startup and look at all that is in the list.
Your security programs MUST be left on but most others can be disabled. Any that you do not know about, just check them out here:
http://www.sysinfo.org/startuplist.php
Type the item in the search box and then decide if you need it running as soon as you boot up.
dave