Thanks Aaron.

Yes. I've made sure that all my files, when building my setup program, go into the Windows System folder.

It's only some files that go into the Temp directory. Part of the requirement of my program is that the user has to have Real Player. It's included on my CD-ROM. And it seems that the Real Player .dll is going into the Temp folder - not the System folder, as it did when I was testing my App.

Any ideas?

Thanks again.