My previously computer crashed so I have had to retrive the data Fallout data from it and put it onto my new computer

I have reinstalled Fallout 3 on my PC but am unsure how/if it is possible to load my previous saved game

Your saves are located in My Documents>My Games>Fallout 3>Saves

In order to retrieve them, you need to have the HDD that you used before. (Unformatted) If it has been formatted, its gone.