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You can get a copy of it here or here. Its freeware that works great.

A good introductory article about pycron can be found at http://www.bigbluehost.com/article4.html
"This article will discuss using a Cron type system, as used on Unix and Linux systems, to bring the flexibility, scalability and a need for more out of a task automation tool, to the Win32 environment."
pycron is a cron service written in Python converted to an executable with py2exe. It's a successor to cron with a couple of changes and extensions:

New in version 0.5:

rotating log file (pycron.log pycron.log.1 pycron.log.2 - each max. 100k)
support of missed tasks ('!' or '*' in front of commands)
output of process id in log file (except python scripts)
support of environment variables in commands (e.g. %comspec%)
weekdays and month can be specified as names
config file pycron.cfg (crontab location, log file location and weekday format)
changed day of Week back to unix format (can be changed to version 0.4 mode in crontab.cfg)