Cannot install pear packages using xampp-full for windows

[tbalon]

D:\>xampp\php\pear.bat install http://creole.phpdb.org/pear/creole-current.tgz
downloading creole-current.tgz ...
Starting to download creole-current.tgz (78,080 bytes)
..................done: 78,080 bytes
could not create lock file: failed to open stream: Permission denied


Anybody know why pear cannot install a package ? I'm developing apps
using Propel ORM and need to load a few packages. I'm running XP Pro.

Tom