i cant delete my files

[ipaintyou323]

i downloaded a couple of video files that all ended up being junk. every time i try to delete them it says that the file may be in use by another program please close down and try again. there is nothing running these programs i closed all uploads uploading these files and i even disconnected from limewire but they will not delete i would like to remove these fies because the were supposed to be kids movies for my children and ended up being porn. i do not want my children seeing this and have already complained to limewire about tags that are not really what is being typed in please help me.