Windows 10: Display of a bizarre window with and 'F' symbol

Since a few weeks, every time I start my computer, a window with an 'F' symbol in the upper left corner appears. I can see this window only if I press 'alt-tab' to scroll among the different opened apps. I have no idea where it came from or what it does. I can remove it by pressing X in the upper right corner, but it comes back everytime I restart. Can you help? Here is a picture of it the skiers at the back is my wallpaper

:)

 

symbols only displaying after another key is pressed.

Hi Alex,

Virus and malware could be one of the possible reasons why you're having trouble with symbols on your keyboard. To isolate the issue, we'd like to ask you a few questions:

• Have you made any recent changes to your device before the issue started?
  
• Did you encounter any error messages while typing the symbols?
• Can you tell us the troubleshooting steps that you've performed?

Meanwhile, we suggest scanning your device using an antivirus program and see if it's infected by a virus.

We'll keep an eye out for your response.

 

f drive

Hello Kathy,

Based on the information you have provided in your post; we need to do further investigation. To assist you better, we'd like to know the following:

• Have you tried using a third party software to manage the disk partition?
• Did you format the drive?

We suggest that you check for the drive in the Disk Management and look if it appears. Follow these steps:

• Log on as administrator or as a member of the Administrators group.
• Press Windows+R key and type diskmgmt.msc and then click OK.

Look if the Drive F: appears and check if it is unallocated.

Looking forward to your update.

 

Erroneous symbols at the bottom left corner of desktop icons

I'm running Windows 10 with the latest updates. A few days ago, the icons for objects on the desktop changed appearance. The icons are correct but
all have a symbol at the bottom left corner:

• Shortcuts show the correct shortcut symbol
• All files erroneously show a shortcut symbol
• Almost all folders erroneously show a shortcut symbol
• Some folders erroneously show "X"

The icons for files and folders (including the Desktop folder) displayed using File Explorer are all normal.

I would appreciate any suggestions.