RGD is talking about a Data recovery program that the OP "may" be able to recover some if not all of the lost data. Even after a system has been restored, reformatted etc.
Just to clarify Liana. Hes saying if it's programs u lost. reinstall them.
If it's data you lost (pics, songs, movies, files etc etc) Then use the link he provided BEFORE YOU DO ANYTHING ELSE and you may be able to recover your data.