perl -V Can't locate Config.pm in @INC (you may need to install the Config module) (@INC contains: …).

powerperl, were there any directories listed there ? Or did it actually specify (@INC contains:) - in which case @INC is definitely empty.

Oddly enough, I've just been building various configurations of unthreaded perl-5.37.1 on Windows. They've all built, tested and installed without any errors but they all have an empty @INC:

>perl -V
Can't locate Config.pm in @INC (you may need to install the Config mod
+ule) (@INC contains:).
BEGIN failed--compilation aborted.
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No such problem with the threaded builds of perl-5.37.1.
I've never seen the like of it before !!

However, if your @INC is not empty, then you and I are almost certainly facing different issues.

Cheers,
Rob