When I open one of my old projects, I'm starting to get a message saying it's missing a file called white_speckles1.jpg located in one of the pinnacle texture directories that does not exists on my computer.  Where can I find this file on the installation discs?

If you can't find it using search, it's probably inside a .cab file on the disc. You could try a repair instalation.

I've uploaded it HERE

and I found it in the location shown below