Thanks for boosting my confidence a little. I found out all of the apps that i installed to the storage card will not run in the start menu. Even when i remove the app and reinstall them to the storage card.
This applied to all of the apps that i installed to the storage card. The apps that i use the windows marketplace to install to the storage is still ok to run from the start menu. What is going on?
After i installed any apps to the storage card, an icon with the standard icon with the app name will appear on the startup menu. when i click on that icon, HD2 will respond: "Can not open the file "XXX" File is not registered with digital signature, or can not find one of the apps element. If this problem persists, please reinstall or restore this app."(i am translating from Taiwanese Chinese). This goes the same thing when i click the shortcut.
You did what I would have done. And you are not sounding stupid. What apps were they? Maybe we can start from there.