Due to some water hitting the outside wall from the guttering last year, it has caused the wall paper above the windows inside. And the plaster below the wallpaper is very sandy and crumbly.
See picture placed on tinypic photo hosting website:
Then I thought I would put some Polycell surface filler down before putting emuslsion paint on top of that.
Grateful for any advice simply explained for a novice about the best way to deal with this problem please. Thanks.