If that was mine I would replace the whole thing, window and all.
A new constrution vinyl window with vinyl brick moulding would never need to be repaired or painted again.
That window should have had a window well in front of it to prevent all the damage your seeing.
By the time you take the time to dig that piece out, wait to have one made, have to pay someone to make it, reinstall it, you could have replaced it in a lot less time and not have to now prime a wooden one paint it, and have to do it all over agin every few years.
Last edited by joecaption; 07-11-2012 at 10:19 AM.