can't delete file

hi all,

i recently accidentally downloaded a .avi file and want to delete it. however, when i try to delete it and empty from trash, it says that the operation can not be completed because the file is still in use. i have no programs running and i already restarted my mac. what is the problem? help!

ps im running osx 10.7.5

thanks

 

thanks so much for the links. doing a secure empty trash worked