Ideally, you should install Recuva before you need it, because if you delete a valuable file and then go online to download Recuva, the process of downloading the installer can create a huge number of temporary files which may overwrite the file you are trying to recover.
But, if this is the first time you have even thought about Recuva, then download it from here
then double click the installer and follow the on-screen instructions.
Before launching Recuva:
- Quit any applications you're not using and don't need.
- If you are trying to recover files from a media card, stop using that card immediately.
Now, you're ready to launch Recuva. The wizard will launch, and you just need to follow the instructions.
For further help, go to http://www.piriform.com/docs/recuva