Ubuntu crashes after graphic card driver was installed

Hi,

I have installed ubuntu on VMWare VM. Then I tried to use my webcam but it failed. I guessed it is due to graphic card driver, so I installed it and then restart ubuntu but I could not log in to ubuntu anymore! After entering my password it says : System problem program detected. I reported the problem but did not help it.
I restarted VM and also windows, but the problem was not solved. I read somewhere that if I disable 3D acceleration in VM setting would solve the problem, I tried it, but did not help it.

Could you please help me?

Thanks,
Karimi