File occupied: If 360 file is running or occupied by other programs, it cannot be deleted. Please close related programs or processes before deleting files.

Insufficient privileges: If your user account does not have sufficient privileges to delete files, you cannot delete them. Before deleting a file, make sure that you have sufficient rights to delete it.

Files are protected: Some files may be protected by the system to prevent accidental deletion. If the file is protected by the system, you need to change the file properties or delete it with administrator privileges.

Disk failure: If your disk fails, the file may not be deleted. In this case, it is recommended to use the disk repair tool to repair the disk error.

In view of the above problems, you can try the following methods to solve them:

Turn off file occupation: open task manager, close related processes or programs, and then try to delete files again.

Elevate privileges: Run the file manager with administrator privileges, or change the file privileges to your user account, and then try to delete the file.

Unprotect the file: change the file attribute to a non-system file or unprotect the file, and then try to delete the file.

Repair disk errors: Use Windows' built-in disk checking and repairing tools or third-party disk repairing tools to repair disk errors.