C:\temp\DBD-Oracle>ppm install DBD-Oracle
====================
Install 'DBD-Oracle' version 1.17 in ActivePerl 5.8.0.804.
====================
Can't unlink file C:\TEMP/DBD-Oracle-1-2100/DBD-Oracle-1.17.tar.gz: Permission d
enied at C:/Program Files/Active Perl/Perl/site/lib/PPM/Repository.pm line 239
Can't remove directory C:\TEMP/DBD-Oracle-1-2100: Permission denied at C:/Progra
m Files/Active Perl/Perl/site/lib/PPM/Repository.pm line 239
Error: Failed to download URL
http://log4perl.sourceforge.net/ppm/DBD-Oracle.ppd: 407 Proxy
Authentication Required

(I did set HTTP_proxy, HTTP_proxy_user and HTTP_proxy_pass but still...)