Instead of installing ActivePerl, you might want to look at packaging your Perl application. Both ActiveState's PerlApp and PAR work well. They put your application, required modules, and the perl interpreter in an executable and optionaly some extra DLLs and archives.

The executable can be run from a CD. The distribution files can also be installed like a normal application. More importantly, it can run without needing to install ActivePerl. This saves all the hassle with dealing with an existing version of ActivePerl.