I found this trick in another forum and apparently it is Adobe approved. If you are finding your PSE opening slow or taking to long to load then remove the Digimarc from the plugin filters.
To do that -
Close PSE (if you have it open)
Go to My Computer / c drive (or whatever hard drive you have PSE installed to) / Program Files / Adobe / PSE / Plugins
In the plugins folder you will see the Digimarc folder. Just rename it and put a ~ before the name Digimarc like this ~Digimarc and save and close.
Then when you start up your PSE again it should run faster.