SceneJS crashes in WinXP

[pusheax]

Hi,

OS: Windows XP
Video: Nvidia Geforce 6600
I'm trying to open simple scenejs scene.
It opens fine for the first time in firefox 15. Then it fails with an error:

"Canvas document element with ID 'scenejsCanvas' failed to provide a supported WebGL context".

When I try to open it in chrome 21.0.1180.89 it fails with error:

Uncaught Failed to create SceneJS Shader: Shader program failed to compile scenejs.js:8665

4GL ERROR :GL_OUT_OF_MEMORY : : index.html:1

WebGL: CONTEXT_LOST_WEBGL: loseContext: context lost

I don't know how to solve memory error.
I have latest drivers and webgl is enabled in both browsers. What could be wrong ?

Thanks,
Vyacheslav