First of all, go to "shopping Cart" and try to find the file. If your "Basket" a lot of files, the search can be carried out with the assistance of the Search window in the upper right corner of the screen. You can also click the right button of the mouse on the Windows screen and select from the dropdown menu the option "Sort". Easiest to do this by date.
If the file has been saved in cloud services such as Dropbox, Google Drive, or SkyDrive, log in to your account and check the trash. From there the file can be restored.
If you are not sure that the halyard was really you deleted, use the tool "Search" available in the menu "start". If the FAL for some reason has been moved to a different place, you will be able to find it.
For preservation of the most important files you should regularly back them up. Windows has built-in backup tools which will help you with this task. Navigate to the folder containing the file click the right mouse button, selecting "Restore previous versions". Backup files can be viewed by clicking on the "Open"button.

In Windows 8 this feature is not enabled by default. So, if you work on a computer that is running the operating system, turn it on.
To restore deleted files, you can use a special program called Recuva. Use this application to scan your hard disk for deleted files, and if find what you need, restore it.
If you need the data deleted by accident, particularly valuable for you or your business, contact a professional service. Before doing this do the following: turn off the computer immediately (the longer it runs, the more data will be written to the hard drive and the less chance to restore a deleted document).