Noooo..huhuhu. i updatedd my drivers and still the same. What should i do?
I Can't afford a new driver or gfx card or a new pc. My Mom won't buy it because she thinks it's just useless.
(yeah, i'm kid.12.)

okay. i'll try to update my drivers and if it still doesn't work, i'll post the error log if the error is still the same.

sigh. My Pc's SPECS are really low i only have Nvidia GeForce FX 5500, 256 RAM. (Mine's Windows Xp)
 

So, you mean i have to update or upgrade my gfx card? or buy a new one?

You mean this ? :

2011-08-20 18:24:42,328 WARN  [com.jme3.system.Natives] Cannot locate native library: windows/bulletjme.dll
2011-08-20 18:24:55,140 WARN  [com.jme3.renderer.lwjgl.LwjglRenderer] Your graphics card does not support non-power-of-2 textures. Some features might not work.
2011-08-20 18:24:59,171 INFO  [mythruna.MainStart] Application info:
Memory usage:
Working memory: 71% (3659232/5111808)  VM Max: 0% (3659232/518979584)

or  this ? :
2011-08-20 18:25:02,218 ERROR [mythruna.MainStart] Unhandled error:Uncaught exception thrown in Thread[LWJGL Renderer Thread,5,main]
com.jme3.renderer.RendererException: non-power-of-2 framebuffer textures are not supported by the video hardware
   at com.jme3.renderer.lwjgl.LwjglRenderer.updateTexImageData(LwjglRenderer.java:1750)
   at com.jme3.renderer.lwjgl.LwjglRenderer.updateRenderTexture(LwjglRenderer.java:1341)
   at com.jme3.renderer.lwjgl.LwjglRenderer.updateFrameBufferAttachment(LwjglRenderer.java:1364)
   at com.jme3.renderer.lwjgl.LwjglRenderer.updateFrameBuffer(LwjglRenderer.java:1395)
   at com.jme3.renderer.lwjgl.LwjglRenderer.setFrameBuffer(LwjglRenderer.java:1464)
   at com.jme3.renderer.RenderManager.renderViewPort(RenderManager.java:1103)
   at com.jme3.renderer.RenderManager.render(RenderManager.java:1164)
   at com.jme3.app.SimpleApplication.update(SimpleApplication.java:264)
   at com.jme3.system.lwjgl.LwjglAbstractDisplay.runLoop(LwjglAbstractDisplay.java:144)
   at com.jme3.system.lwjgl.LwjglDisplay.runLoop(LwjglDisplay.java:185)
   at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:218)
   at java.lang.Thread.run(Unknown Source)

this seems interesting. When i have mythruna fixed, i will have a look on this "Underwater city"
(my problem is instruction at 0x04f1c5b5 referenced memory at 0x0507c798. Memory could not be read.
if you could help me it would be great and appreciated)

So, okay i download mythruna for windows (mine's xp) and i extracted it from it's zip or rar file.
I ran Mythruna.123123(whatsoever).exe and it brought me to the options bar (thing) and when
i hit "ok" it says:

  (X) "The instruction at "0x050dc5b5" referenced memory at "0x0523c798".The memory could not
        be "read".

         Click on OK to terminate program      _________
                                                          |___OK___|





Please i need help!