You can try starting a new character at the beginning of FoV without causing a conflict with your existing character (as long as you are not just relying on the auto-save, which could get over-written), and you can back up your saves first if you wish. Trying a new character might help narrow down what the problem is.
Did you email support@larian.com, with a description of the problem and maybe a link to this topic? See the DKS
support page.
In Vista / Win 7 the saves are in the folder below. You may need to set Windows Explorer to show hidden files and folders (see
here).
C:\Users\ %username% \AppData\Local\Divinity 2\Savegames