voltage regulator replacement

I think i have just messed up my arduino.. I've accidentally set the external power source to 12 v and crossed some wire (it was a bit messy and i dont remember exactly what i did) and i think the voltage regulator short circuited and a couple of minuts after it was still very hot..

Is it possible to replace it? Or is the problem probably somewhere else?

Every thing in the board seams to be working just fine except for the 5v and ground..

Cheers!

yes it is possiable to replace it, and yes there could be other componets that were damaged at the same time. check them all.
(note: if your not great with soldering/de-soldering SMC's it be best to just buy a new one)