LoadModule perl_module modules/mod_perl.so
This setting specifies the location of the mod_perl module relative to the ServerRootsetting, so you should put it somewhere after ServerRoot is specified.
Win32 users need to make sure that the path to the Perl binary (e.g., C:\Perl\bin) is in the PATH environment variable. You could also add the directive:
to httpd.conf to load your Perl DLL, before loading mod_perl.so.