Are you playing under the same user account that you were when you started? Any manual saves or quicksaves from D2:ED should still be available, even with the autosave being overwritten when you started FoV.
If you want to check, in XP the saves are in the folder
C:\Documents and Settings\ %username% \Local Settings\Application Data\Divinity 2\Savegames
or in Vista / Win 7
C:\Users\ %username% \AppData\Local\Divinity 2\Savegames
You may need to set Windows Explorer to show hidden files and folders (
XP, Vista,
Win 7).