crase123

Try changing that if statement in the destroy event to this:

if (instance_number(obj_death)<=1)
{
instance_create(320,200,obj_win);
}

In what event is you're code?
It should be in red's destry event :GM124:/> I think
Also you should use comments, not strings to inform the user of about the code like this:

if !instance_exists(obj_death/*red dot*/)
then instance_create(320,200,obj_win/*yellow dot*/)

the momentum of me pushing it will not make it go horizontal at the same time

Set the hspeed as well has the vspeed?

Yet i have to problems, first off when i push the crate onto the gravity box and it starts bouncing, the player jumps on the box, and as its falling upon meeting the gravity box it cause the player to disappear

Post thine code from thow the player's step and collision events.