Windows sweating are a sign of too much humidity in your home, do you have exhaust fans in your bathroom to exhaust to the outside? Do you have your dryer vent exhausting outside? Do you have alot of plants in your home? Do you cook with boiling water alot? Are you using any sort of vent free heating system in you home? This can add a ton of moisture. Here's a link that'll help with other sources.
http://alsnetbiz.com/homeimprovement/faq12.html