You may find that PPM is the easiest route for ActiveState Perl, Apache2 and Win XP. I did this recently and got it to work OK. The Installing from PPM Packages section of the documentation explains what to do in detial.

Add the following to httpd.conf

# 
# http://perl.apache.org/docs/2.0/os/win32/install.html
LoadFile "C:/perl/bin/perl58.dll"
LoadModule perl_module modules/mod_perl.so
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