i open the PDF in to my browser, when i click any link it open in the same window/page. I want it open in to new page/window.

Go to Edit - Preferences - Documents and tick off the box that says "Open cross-document links in same window".

Sorry, I didn't notice the browser part. The only way you can change it is by converting the links to use a script that tells the browser to open them in a new window, and even then it might not work. You can use this tool I've developed to achieve it: Custom-made Adobe Scripts: Convert all links in a PDF to Open In New Window