How do i solve the Minecraft Java problem?

[NrdAlrt13]

Ok, so I followed this youtube tutorial of how to install minecraft mods and everything went well until I clicked the play button. after i clicked it, it told me there was an error with the java virtual machine. I've already tried one solution on this website and nothing happened... it didnt work. So if anyone knows a definite way to stop the error then please reply.

The youtube tutorial was postedby 'BeckBroJack'

 

[Zkye]

Does it work without mods? How are you installing them? Using Forge or just copy them into minecraft.jar? You could try installing them one by one if it worked before.