Disk Drill is a file recovery program for Windows which uses a number of different techniques to scan your drive in search of deleted files. Even if they've been deleted long ago, and wiped from the recycle bin, Disk Drill claims that it can find them. And once the file has been located, getting it back is just a case of a single click.
Disk Drill is easy to use. Just tell it which drive to scan, then leave it to do its work for a few minutes as it builds a simple tree of all the deleted files it finds. You can then browse that tree, locate the file you want, and get it back. It works really well, too. In my tests it was quick, easy and reliable.
Disk Drill is a paid-for product but there's a free demo version which will allow you to recover 100 MB of files in total. So that's a single file of 100 MB, 4 files of 25 MB each, or any other combination.