System reinstallation or restore won't make the previous files deleted permanently. I think the files you forget to save is still on the hard disk of your computer. In this case you can rely on utilities, more specificly file recovery software
to help. Here I list some both freeware and shareware for your reference.
Recuva - http://www.piriform.com/recuva
PC File Inspector - http://www.snapfiles.com/get/pcinspector.html
Wondershare Data Recovery - http://www.disk-utilities.com/data-recovery/
Easeuse Data Recovery Wizard(recover 1 GB data free of charge) - http://www.easeus.com/datarecoverywizard/free-data-recovery-software.htm