your windows will have beads to take glass out because you cant fit a glazed window,it might be externaly beaded so beads are on outside.any probs visit my website and use contact page with prob.
shaun www.sdwupvcrepair.co.uk, February 2008
Condensation means that your glazing panels have failed - they are held in by the plastic glazing beads which have to be very carefully prised away. The inner fixing is usually made using a special double sided foam tape - this too has to be slit before the glass panel pops out.