... give a try to strawberry portable edition which comes with portableshell.bat a small launcher that build up a clean PATH for you.

Good advice. I've lost count of the number of times that the answer to a Strawberry Perl question on this forum has been "use the portable edition".
It made me wonder why Strawberry Perl promoted the msi edition as the "Recommended version" ...so much so that I decided to "poke the bear".

Cheers,
Rob