Sounds like your new windows are much better than your old ones, and the house is now much tighter than it was. This is a common problem in well sealed houses. We have Anderson double pane low E windows, and they fog up inside when we boil things on the stove in the winter. The best solution is natural ventilation. Try leaving the window open a crack behind those heavy drapes. We have a fairly powerful kitchen vent fan, and I keep the fireplace air inlet open a bit all year to provide replacement air. You do want to solve that fogging problem because that excess moisture could start rotting your new windows; unless the are vinyl clad.