As I said,
The problem seems to be with the Windows registry. Having updated Perl several times, the various versions seem to have left confusing stuff behind in the registry. I therefore uninstalled all versions of Perl, and ran ERUNT and NTREGOPT to clean the registry. From this point, a clean install of Perl 5.12 (which I had tried unsuccessfully before) gave me a system that installed the essential modules and got Bugzilla running.But this may not be your problem. If so, I can't help. You might also want to try other registry cleaners.
In reply to Re^3: PPM has module but BugZilla says it's missing - redux
in thread PPM has module but BugZilla says it's missing by davies