Storing default win32 ActivePerl perl in a directory called 5.10 will break @INC, see How is the default @INC constructed? 
$ perl\bin\perl.exe -le "print for @INC"
C:/tmp/ActivePerl-5.10.1.1006-MSWin32-x86-291086/ActivePerl-5.10.1.100
+6-MSWin32-x86-291086/perl/site/lib
C:/tmp/ActivePerl-5.10.1.1006-MSWin32-x86-291086/ActivePerl-5.10.1.100
+6-MSWin32-x86-291086/perl/lib
.

$ rename perl 5.10

$ 5.10\bin\perl.exe -le "print for @INC"
C:/tmp/ActivePerl-5.10.1.1006-MSWin32-x86-291086/ActivePerl-5.10.1.100
+6-MSWin32-x86-291086/5.10/lib
.

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In reply to Re^5: @INC site/lib problem on Windows 7 and XP (ActiveState Perl) by Anonymous Monk
in thread @INC site/lib problem on Windows 7 and XP (ActiveState Perl) by Anonymous Monk

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