I just learned how to copy videos to my hard drive using a couple of tools. I'm a novice feeling my way around in that department and I ran into a problem. I don't know how to an MPEG-4 file off my hard drive. How do you delete them off your machine? The pic below represents one of many MPEG-4's I can't delete. I think the stubbornness might be related to Nero as the files will play only with Nero and not with RealPlayer or Windows Media Player. I went into Nero's control panel and I didn't see an ON/OFF button.
You can use 'Unlocker' - but perhaps it might be simpler to open Task Manager to see if the some process is running that may be holding control. Example: perhaps Nero never exited gracefully and is still running silently and just needs to be ended using Task manager - then you can delete the file as you normally would. http://ccollomb.free.fr/unlocker/