A window in a dream often reflects perspective -- how much you can see of a situation, or how visible you feel to others. A clear window can point to clarity or opportunity coming into view, while one that's broken or blocked may name a fear of being exposed before you're ready.
When the significator of either good or evil shall be stationary, and angular, it shall be more durable. But it shall be the more mutable and variable, if the significator shall be cadent from angles, and retrograde. - William Lilly (1602.-1681.)