I am having a problem with the Display on my Laptop running Ubuntu 10.04

Since last few days, I am using the laptop in low-graphics mode. When I try to run the command glxinfo, I get a error message

xlib extension glx missing on display !:1.0

and causes a Segmentation Fault.

I am using Toshiba Laptop with 945GM/GMS, 943/940GML Express Integrated Graphics Controller ( Output from lshw )

Note :

I was using Sony Laptop with NVIDIA Graphics card. I took the HDD from Sony Laptop and put it in Toshiba Laptop having Intel Chipset Graphics Card.

Since then, I am having the problem with the display.

I tried to remove the drivers from NVIDIA but with no success.

Please let me know, how to remove the NVIDIA drivers completely and install Intel Drivers.