DBD-mysql could not be installed on Perl shipped with H-sphere.
C:\\Program Files\\HSphere\\3rdparty\\Perl\\bin>ppm install DBD-mysql
Downloading DBD-mysql-4.020...failed 401 Authorization Required
ppm install failed: 401 Authorization Required
Install new version of Perl manually. Also you can get Perl version in http://code.activestate.com/ppm/DBD-mysql/