How recently did you delete the file? If it was very recently, stop using the hard drive it was on as there may be a chance to recover the file with file recovery software.
I recommend having a look at photorec ( http://www.cgsecurity.org/wiki/PhotoRec ). I've had success recovering files with this before. It is recommended to run this from a live CD or different hard drive so you don't write to the hard drive you are trying to recover from.