Thank you for your previous suggestion. I just tried running this command after installing kernel 3.7.2 again.
but the output was
sudo apt-get install linux-headers-$(uname -r)
Now i just tried purging the ATI Legacy Drivers as follows (These was the same steps I used to setup the drivers in the first place for kernel 3.5):
Reading package lists... Done
Building dependency tree
Reading state information... Done
linux-headers-3.7.2-030702-generic is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
After the purge was complete, I did a reboot, it restored the system back to its former glory, Unity is running, and so is Compiz.
Under "About this computer", its says that my vga drivers are "Gallium 0.4 on AMD RV710".
but my grapics seems fine, I played a movie (Django Unchained (2012) ) and its was running smooth. Do i need to change the driver for better performance? or should i leave it as it is.
My Graphic card
302 frames in 5.0 seconds = 60.232 FPS
300 frames in 5.0 seconds = 59.882 FPS
300 frames in 5.0 seconds = 59.891 FPS
300 frames in 5.0 seconds = 59.844 FPS
Thanks in Advance
02:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI RV710 [Mobility Radeon HD 4300 Series]