Home Alarm

I recently had new windows put up in my home and all sensors are working fine except one. I actually relocated it to a different part of the house since one of the windows is just a fixed non opening window. How can I reset this sensor? The problem is causing me to leave the alarm unarmed everyday for about 2 weeks now. It is a Digital Security Controls sensor, which is a company owned by Tyco, which owns ADT. I am thinking about calling ADT for maintenance but that means atleast 115 US$. Any help would be appreciated. Thanks.