My standard ATI uninstall:
A) Run the ATI un-installer, from the ATI site for Win7:
1.Click on Start
2.Open the Control Panel
3.Select Programs and Features
4.Select ATI Catalyst Install Manager
5.Click on Change
6.Follow the wizard to uninstall all ATI software
B) Shut down the pc
C) Pull the card
D) Install new card, in your case you have on board video so skip this
E) Start the pc
F) Install/update new video drivers
A) Run the ATI un-installer, from the ATI site for Win7:
1.Click on Start
2.Open the Control Panel
3.Select Programs and Features
4.Select ATI Catalyst Install Manager
5.Click on Change
6.Follow the wizard to uninstall all ATI software
B) Shut down the pc
C) Pull the card
D) Install new card, in your case you have on board video so skip this
E) Start the pc
F) Install/update new video drivers