SimSun, which comes with Windows, should have the Hanyu Pinyin characters in
it. Do you know how to install the Chinese support and Chinese IME? One of
the tools with the IME is a software keyboard with the Pinyin characters, so
you can type directly in Pinyin and have it show up. [or, if you are looking
to type Chinese by using PinYin, that's what the IME does by default]
Go to the Regional and Language Options in the Control Panel to get the
Chinese support installed and enable the Chinese IME.