When I get to a certain point on the map (on the 4th level) the game stops stop and I get this message :

The instruction at 004cbe referenced memory at 000a0a00
The memory could not be read from

Also says that WW.EXE has stopped working.

Please give help.

If you're referring to the maze-like level and the crash when you try to go over the water with your cruiser, you can avoid the crash by hugging the leftmost "wall" of resources. It's a little finicky but definitely doable.