where to write my CRON commands on windows 7 (localhost) ?

Dear experts,
I wanted to know how can i do a scheduled tasks but now i know that the only solution is cron.

my problem is now
where can i write down this line so that it can be executed ?
* * * * * /path/to/scriptname.php

btw im using xampp apache server on windows 7 and using php.

thanks in advance.