Ruy Lopez ?

Is there a refutation to the following Ruy Lopez line (I use this as black against e4)

1. e4 e5

2. Nf3 Nc6

3. Bb5 a6

4. Ba4 Nf6

5. 0-0 b5

6. Bb3 Nxe4

a quick look with Fritz shows that Re1 and so on regains the pawn but that black at least gets equality and a nice development.

Similarly, in the standard line of the open Ruy,

e4 e5 Nf3 Nc6 Bb5 a6 Ba4 Nf6 0-0 Nxe4, why doesn't white then exchange and take the pawn on e5? Bxc6 dxc6 Nxe5

Yes, this is just the Open Spanish. 7.d4 is the book response, although it is nothing of a refutation. 7.Re1 is straightforward, but does not put as much pressure on black's center.

As far as why not make a sort of exchange variation out of the open: 7...Bc5, and black has an advantage. It looks like white has to play 8.Nd3, where he has no hope but draw. Not only is this position cramped for white, but black will have an easy time creating a kingside attack.

You should know that I am no expert on the Spanish. I believe I know the answer to your question, though. The standard order of moves is

1.e4 e5  2.Nf3 Nc6  3.Bb5 a6  4.Ba4 Nf6  5.0-0 Nxe4  6.d4 b5  7.Bb3 d5

In your line, the bishop was kicked back a move earlier. This is still just a transposition of the Open Spanish, though, and the book move is 7.d4. The reason for this is to place pressure on the center. The bishop is no longer threatening the knight, and so is no longer exerting pressure on e5. So your question becomes 'Then why, when the bishop is still on a4, do we need to challenge the center with 6.d4?' The answer is that the main line anticipates ...b5. If white were to play 6.Re1, black could respond 6...b5, where there will be less of a challenge to the center. 6.Re1 and 7.Re1 are still decent moves, of course, but are probably not the very best.

i dont like ruylopez

 How is it a win for white? He is a two pawns down and undeveloped. His only compensation is two pieces for a rook.

it just is... White gets all his pieces out no problem which is more than can be said for black.  Black has a weak pawn, poor king and fewer pieces.  It's a very well known line and is good for white. 

 or for more detail here's how capablanca played it.   5.0-0 is the mainline of one of the oldest, soundest openings in chess.  You are really going to struggle to refute it on move 5 with obvious/natural moves.  Most of that combination is forced, and people are still playing the ruy (almost never 6.exd4?! though)