I can't remove a malware file from my usb. when i move it to trash i get this: "Item “mbdm.exe” is locked. Do you want to move it to the Trash anyway?" and ill click continue. Then i get this message: "The operation can’t be completed because the item “” is locked." I am the admin on this mac. When I "Get Info" on the file I see the "Locked" tick box is ticked and I cant un-click it. It's NOT grayed out. The sharing and permissions say I can only read the file. See pic attached of "Get Info"