MS Office 2010 Error 1714

When I install Microsoft Professional Plus 2010. I get this error.
"Error 1714. Setup cannot remove the older version of Microsoft Office Professional Plus 2010. Contact Microsoft Product Support Servivces (PSS) for assistance. For information about how to contact PSS, see
C:WindowsTempSetup000000f0PSS10R.CHM.
Setup failed. Rolling back changes…"
What should I do to install Office 2010?
Please help.
