hiii,
please check ms office 2007 is installed on your target machine.
and one more thing to install i.e. office 2007 primary interop assembly download it from here
http://www.microsoft.com/en-in/download/details.aspx?id=18346[
^]
you will get solution.
if your unable to install PIA on target machine
download Microsoft.Office.Interop.PowerPoint.dll
and add it into your project reference
have happy coding