To dream of a black window represents feelings of being trapped in a sensitive, volatile, and unforgiving situation. You may feel that there will be permanent or hostile consequences that you will be powerless to stop if you make a single mistake.
Alternatively, a black window may reflect your own sensitive hostile intentions towards someone else. You may be ready to exact harsh revenge or consequences on someone else if they upset you in any way at all.
Example: A woman dreamed of having black windows under her skin. In real life she has a volatile relationship with her daughter and was ready to give her up to social services if her daughter got out of line at all. The black widows under her skin reflected how frustrated and ready she was to exact harsh punishment on her daughter at a moments notice.