Windows 10: Why is Notepad launching on it's own and saying "not a valid file"?

Hi,I started up my computer the other day and was prompted to sign in to my Microsoft account, which is unusual. Now for the last few days Notepad launches on its own with a modal stating "Can't file file: C:\SYSTEM:{SOME HASH STRING HERE} do you want to create it?". Recently it's just launching on its own and saying "not a valid file". I have tried uninstalling Notepad and reinstalling it, that didn't work. Please can you point me in the right direction.Thanks

:)

 

Ascii file in Notepad

Hi GreenGreen2,

This statement of an issue is quite unclear and incomplete to be understood by our readers. It is too broad for us to distinguish the main reason why you are having challenges/concerns with
Notepad. To have a better understanding of your concerns, we'd like to ask you some questions:

• What is this file? Is it a Notepad
  file with ASCII characters inside it? or is file with ASCII characters named on it?
• What is the file extension of this file? Is this a .txt file or not?
• Where is this file came from?

• Can you give us a step by step walkthrough on what you’re doing?

• Can you create a new user profile and test if the issue will still happen in the new user profile?
• What were the recent changes made on your part before you experienced this issue?
• Can we have a screenshot of this file? This is to give us at least an idea what type of file is this.

In addition, you can read our forum guidelines here:
How to ask an effective question to help you phrase and compose your concerns in complete detail here in our community. In this way, the readers will get enough information that will lead them to provide you accurate resolutions instead of
having assumptions and guessing.

To notify us and have us get back to you, simply reply to this post.

 

Notepad

Hi,

Thank you for posting your query in Microsoft Community. Appreciate your interest in using Windows 10.

I suggest you to follow the steps provided below:

• Open Task Manager. Here’s a tip: press CTRL+SHIFT+ESC.
• Click on Startup tab.
• Select Notepad from the list and click on Disable.

Hope the information is helpful. Feel free to write to us
for any other assistance with Windows, we’ll be glad to assist you.

 

Notepad

I followed your suggestion but wasn't able to find Notepad listed on the startup. There are some listed as program but don't know which ones it could be.