You may need to enable hidden folders first if it doesn't work:
- Go to "Control Panel"
- Click on "Folder Options"
- Click the tab located at the top named "View"
- Select "Show hidden files, folders, and drives"
- Click OK
Here is how you change your account picture back to its default:
- Go to "Computer"
- Click on "Acer (C:)"
- Type in "Default Picture" in the search bar.
- Click on "Default Account Pictures"
- Drag image named "user" to desktop.
- Go to start screen.
- Right click your profile picture located on top right corner of start screen.
- Click "Change Account Picture"
9. Open "Browse"
- Look for the picture you just dragged on to your desktop.
- Select the picture.
- Your account picture should be back to the default picture.
Hope this helped!