How to delete Undeletable virus file ?

1] Open Notepad.exe
2] Click File>Save As..>
3] locate the folder where ur undeletable file is
4] Choose ‘All files’ from the file type box
5] click once on the file u wanna delete so its name appears in the ‘filename’ box
6] put a ” at the start and end of the filename
(the filename should have the extension of the undeletable file so it will overwrite it)
7] Cick save,
It should ask u to overwrite the existing file, choose yes and u can delete it as normal.
thank you.