Graphics card.
And if you can't buy one or you can't install a new one, You're forgeted.
You must have a really stuffty graphics card if it makes a java applet that probably doesn't take more them 400 mb of RAM crash.
Do me a favor and tell me what Graphics card you have.
I don't remember it's name.
Hopefully not Intel >_<But about Minecraft crashing, it just makes glitchy lines, which annoy me.
And if I don't close MC, they multiply.