depends on how big your hdd and how much file is on that hdd that needs to be recovered. but one thing for sure, you SHOULD STOP USING YOUR PC NOW. because everytime you turn in on, windows creates swap file and that will overwrite the allocated file table for the deleted file, reducing your chances of success in file recovery attempts. here is a free utility for you to try http://www.aumha.org/a/recover.php or http://www.pcworld.com/downloads/col...ads/files.html to try out the freebies and get the cracked one from other sites if it proves to be effective.
btw, check your recycle bin just in case.