I could not find Microsoft Word!

Hi all,
Recently I have upgraded my OS from Windows 7 to Windows 8 and it was successful. But, I am facing problems with the MS Word only. I wanted to pin the MS Word application to the task bar. But, I couldn't find the MS Word application anywhere except the taskbar. I am not able to select that as well. However, I am able to see all other Microsoft applications like MS excel, MS PowerPoint etc., I have a genuine copy of MS Office but why am I facing this problem? Can somebody help me out.
Thanks!
