For some reasons, in my Registry, there are "HKEY_CURRENT_USER\Software\Evernote\Evernote5" and "HKEY_CURRENT_USER\Software\Evernote\Evernote3", besides "HKEY_CURRENT_USER\Software\Evernote\Evernote" where most items locate. I deleted both "Evernote5" and "Evernote3", now it works!
I replied with detailed error messages in another post. Hope it helps for your reference.