Hi is their anyway to make the game run in windowed mode? iv tried adding -windowed but it doesnt launch then iv also tried alt+enter the colours corrupt and then crashs any ideas?

Haven't given it a try with Constructor, but I've had luck with D3Dwindower and other games... not all games seem happy with it. JA2 seems to insist on coordinates from the upper left of your screen, even if the window starts in the middle for instance. But it's worth a try

http://www.gamefront.com/files/13838785/D3DWindower-English/
Or you might give dxwnd a try. Haven't tried this though
http://appaholic.wordpress.com/2007/10/16/dxwnd-force-almost-anything-into-a-windowed-mode/

Of course, how it works with a gog-fixed game. I do not know

I've tried both of those programs and I've had no luck.