I tried to highlight and right click on it to search it. After a second or two, a window appears saying "This accelerator is not available at this time. Try a different accelerator or try again later." It happens to me after the first time I restart my computer and really annoying. I tried the Bing add on but with the same problem. Highlighting a word and then Google searching via right click is faster...... than copy and pasting doing it in another window.
Someone help me!
SOLUTION: I'VE FOUND THE SOLUTION! It was under Security settings of Internet options. I had Protected Mode on and can do it once again after I disabled it.