Trying to reinstall iCal off instillation disk using Pacifist, having problems!

I deleted iCal.

I tried reinstalling the application bundle off the instillation disk and it said it cant do it on this computer, no error number or explanation.

I have tried to reinstall it from the instillation disk using Pacifist but every other app is listed except ical. I have tried the search option, it's just not there!

Any help I would appreciate.

I am running a MacBook 2009, OSX 10.6.8. The disk is 2.6.4

Thanks!