I'm guessing the time controls were pressing, particularly on move 37. An idea a bit earlier may have been to keep the c pawn by preparing its advance a bit better, instead of exchanging this pawn a pair of rooks and the a pawn. at that stage with the bishop advantage it should have been easier to pin black down and force concessions than you found on the fateful 37th. Good game overall.
>:)
37.Bxf6?
37.Bd4!....Kg7 (f4,g4+,Kh6 all loose a pawn) 38.Ra7 +-
so blacks only hope is
37.Bd4...Rf8! 38.Ke3!
whites plan is to play ke3,kd3,kc4,kd5 blacks rook and king have to constantly gaurd the f6 pawn once whites king reaches d5 if Rd8+ then white has Rd6 and his king is penetrating nicely.
if black at any point plays g4 then white replys with h4 and if black ever plays f4 white replys with g4 exchange pieces NOT pawns when up material
I think white has good winning chances in this manner but victory is still not certain
You threw away your c pawn and you threw away your dark-squared bishop. Any number of moves could have prevented either or both. You need to work on your understanding of piece-trading situations. On move 31 you initiated a trade that resulted in a loss of material (a rook and a far-advanced pawn for a single rook). Sometimes we are forced into trades where we lose material, but there is rarely a reason to initiate such a trade (unless you have calculated that the sacrificed material will give you some sort of advantage). You do the same thing to even worse results on move 37, when you give away your bishop (bishop and a rook for a single rook).
I recommend you play through this game with any good chess analysis program and see what its suggestions are starting at move 25 or so. I use Shredder for the iPhone.
http://www.chess.com/echess/game.html?id=25963868
Were there any chance to win this game and how? Thank you.