Really nothing more user friendly than free WinPatrol: http://www.winpatrol.com/
Right click the little scotty dog in the system tray and choose "Startup info." A list of everything set to start automatically will be presented. Select the program or process that you want to control with a single left click to highlight, and then push the "Disable" button at the lower right. Done. The entry is not removed from the list, and will function normally when started manually. If you want to turn it back on for auto-start, just return to the list, click it, and now it is an "Enable" button. WinPatrol will even disable itself! Scotty also acts as a basic system monitor giving you choices when stuff happens without your knowledge--like applications setting thmselves to auto-start.
For what I have learned about controlling my processes, with web addresses of useful tools and informational sites, see my Vox: http://doc1101.vox.com/
The "links" are not "live." To view the referenced pages, copy and paste the URLs to your browser address bar. No ads, no spyware, nothing to buy (or donate) just info.