Photoshop messing up contrast?

[On Holiday]

I've put this here as there's more chance it'll get seen.

I'm a beginner to photography hence only just started to use Photoshop.
The problem I'm having is that in Windows Photo Viewer (before edit) it looks fine, but once I open in Photoshop the image appears brighter/more contrasted?

Any ideas which settings I need to change?

Best image I can example it on unfortunately;

Before opened in Photoshop (Windows Photo Viewer) -> http://flic.kr/p/dH8f5S

What's shown in photoshop -> http://flic.kr/p/dH2Pzr

 

[On Holiday]

Neither of those images had been edited in any way. They came straight off the camera. I was meaning as soon as I open Photoshop then it's noticeably different than what it looks like in Windows Photo Viewer.

Haven't changed any of the PS settings.

 

[On Holiday]

view - proof setup - monitor RGB.

Merry Christmas.

Thank you