Hi, RAHUL VERMA!
Press the Application key (just at the left of the right Ctrl key) and the contextual cell menu will be pop up. Then choose the Open Hyperlink (penultimate entry in 2010 Version).
A faster shortcut: Application key, cursor up twice, Enter.
Regards!
Thanks SirJB7....But i want an even more simplified shortcut. A shortcut which only requires to have use of combination of maximum two keys...like for eg. "ctrl + E". I didnt get any of it till now for opening an existing hyperlink on a cell.