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you need VNC viewer to install on windows pc...
http://www.codeproject.com/Articles/521724/Connect-to-Ubuntu-from-Windows
Another way as PuTTY which allow you to log in to any Linux machine using either SSH or Telnet.PuTTY is free and they have an in-depth documentation which can be found here:
http://the.earth.li/~sgtatham/putty/0.63/htmldoc/index.html
Good luck.