Powerpoint and WordViewer services not found in MOSS 2010

Hi friend,
I have checked my central administration and found that powerpoint and word viewer services are not installed on server. I have googling and found that Microsoft Web Application patch is needed for this service.

Below are some reference link which have mentioned how to install and configure powerpoing and word viewer services on central admin.

http://technet.microsoft.com/en-us/library/ff431687.aspx
http://www.microsoft.com/downloads/en/details.aspx?FamilyID=27d81b1c-18ae-4983-8e1c-224bb747eb99&displaylang=en
http://support.microsoft.com/kb/2028346
http://www.sharepoint24x7.com/tag/sharepoint-foundation-2010/