Hi Neemobeer,
Not sure when or if you and this message will ever catch up with each other but for what it is worth I am extremely grateful to you for taking the time and making the effort to post this tutorial on how to reset Cortana. Somehow my 'Searches' through Cortana became depleted and files/folders I had, previously, found regularly and consistently went "missing", or were a 'no show', such as 'Create a Restore Point'. I think, perhaps, this might have been due to a 'Secure Cleaning" program I was "trialling" (needless to say, now uninstalled) but not one of the more well known ones. I won't name the product because it is purely conjecture on my part and I could be doing them an injustice and I accept full responsibility for what I selected to be securely cleaned. Having followed your recommendations (with a degree of trial and error. In addition to which, I had to employ the use of 'Unlocker' because renaming the folder Microsoft.Windows.Cortana_cw5n1h2txyewy (to .old) would, otherwise, have been well nigh impossible, due to it being in constant use. Trying to 'End Task' for Cortana through 'Task Manager' proved fruitless as Cortana is used incessantly. Subsequent to successfully completing the steps in your recommendation. I have found that the 'Searches' have been fully restored to their previous capabilities, so I am indebted to you. It always 'bugs' me when something on my PC creates an issue and find I have to persist until I find a method to resolve the issue. At least, such an occurrence provides a valid learning experience, for me and a sense of accomplishment when I succeed in remedying the problem.