Looks like you are (or have been) using MKS, which can confuse things such as which shell dmake invokes and so on. I suggest you remove it (the path to MKS) from your system PATH variable (example). Once you've done this start a new command prompt and retry the installation.

In reply to Re^9: Installing CPAN modules fails by marto
in thread Installing CPAN modules fails by ehsanakbar

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