double glaze window not closing back

[Summi]

Our bathroom window on first floor is not closing back. The handle on window is not moving to full 90 degrees as it should - instead it moves only 45 degrees now.

I notice a tiny metal point at the bottom of the window that I suppose should go in/out into the window to close/open the window. This metal is not moving.

Any advice to help fix is much appreciated as I have a 1 month old baby and want to keep house warm.

[welsh brickie]

the mechanism could be broken or just seized, try spraying WD40 on it and slightly tap the metal to free it,If its broken call out a double glazing firm they will have the parts,Its not that expensive.