Installed program now appearing in Add/Remove Programs

I need to uninstall some unnecessary programs on my Windows XP computer via Add/Remove Programs applet on the Windows Components option. Whenever I click the Add/Remove Programs applet i get this error message.
What could this error mean?
Setup library ocmsn.dll could not be loaded, or function OcEntry could not be found.
Contact your system administrator.
The specific error code is 0x7e.
