This particular forum (sharing and storage) was created to help those transitioning from Photoshop.com to Adobe Revel. I am moving your post to the proper forum so that it can get proper attention.
We also have many other forums relating to other Adobe products at: http://forums.adobe.com.
In the Elements Organizer program, go to Edit/Preferences and uncheck all of the Media Analyzer options.
I just changed from PSE 11 to 12. With eleven all was fine with the auto analyzer, but with PSE 12 it has become a real pest -using lots of RAM and > 25% of CPU.
Though I unchecked all options the Auto Analyser started every time I opened PSE 12. I also checked the autostart options and the Registry. Finally I renamed the Program, similar to this instruction: http://barbarabrundage.com/2013/10/31/the-elements-12-auto-analyzer-adobes-evil-undead/
This works, but that cannot be the only sulution (apart from using the old version).
I hope someone has a good solution for this annoying part of PSE 12