or download this
C:\Documents and Settings\Administrator\Desktop\Math-Pari-2.010706>per
+l Makefile.PL paridir=E:\perl\site\lib\PARI
Setting up Math::Pari with Perl 5.006001 on MSWin32 version 4.0;
cc=cl, gccversion=, ccflags='-nologo -O1 -MD -DNDEBUG -DWIN32 -D_CO
+NSOLE -DNO_STRICT -DHAVE_DES_FCRYPT -DPERL_IMPLICIT_CONTE
...
Note (probably harmless): No library found for '-lm'
Writing Makefile for Math::PARI::libPARI
Writing Makefile for Math::Pari