Photo booth not supported on this architecture

Hi,

I have a problem... recently i've got 20" iMac with Intel processor (Mac OS X 10.5.2)

One day I noticed that I don't have Photo Booth program any more. I don't really know what happened to it... So I reinstalled it from the disc that came with my computer.

However when I try to run it I get error message: Cannot open the application: Photo Booth because it is not supported on this architecture.

Before it disappeared from my computer it was working fine. I didn't install any suspicious programs for the camera, so I don't think any other program messed it up...

What happened? How can I fix it?
I tried looking for answers here as well as on Apple forums, but with no avail...

Please help.
Thanks

Did you run Monolingual?
Because this will strip unwanted Architectures (if you don't untick them).

If so then I'm afraid you will need to re-install OSX.

Don't worry, do an archive and install and you will lose nothing except recent updates. If you are worried then back up any docs etc that are irreplaceable.