If you are unable to delete the mp4 format files then you can try out the following steps.
This problem is caused by software collision.
Step 1
Restart your Computer and check that if you are able to delete the mp4 file
Step 2
Restart your computer and quickly press F8 key and select "reboot" option with the arrow keys
Step 3
Press ctrl + alt + del or right click on the task bar
Now, Select Task Manager
Go to "Processes" tab
Select "Explorer.exe"
Right click on it and click on end process
(***Make sure you don't close the task manager if have done it then press ctrl + alt + del key and restart your computer*** )
Now, click on file on the menu
New task (Run)
type explorer.exe
and click OK
You will now able to delete the mp4 file
But the permanent fix is to re install the operating system or uninstall the conflicting software affecting the codec.
This problem is caused by software collision.
Step 1
Restart your Computer and check that if you are able to delete the mp4 file
Step 2
Restart your computer and quickly press F8 key and select "reboot" option with the arrow keys
Step 3
Press ctrl + alt + del or right click on the task bar
Now, Select Task Manager
Go to "Processes" tab
Select "Explorer.exe"
Right click on it and click on end process
(***Make sure you don't close the task manager if have done it then press ctrl + alt + del key and restart your computer*** )
Now, click on file on the menu
New task (Run)
type explorer.exe
and click OK
You will now able to delete the mp4 file
But the permanent fix is to re install the operating system or uninstall the conflicting software affecting the codec.