There are many programs that can recover deleted files. Do a Google search for deleted file recovery.

If it's important, take wombats advice and send it to a professional like Ontrack. File Recovery - Recover Lost or Inaccessible Files - Ontrack Data Recovery

The file is likely still there, just marked by Windows as deleted and can be overwritten. So the more you use the computer the more likely that area will be overwritten with other data.