Aero Theme

I have Windows Vista. And my graphic card 9600 is installed but still in the theme option I cannot see Aero theme. Before i have Aero but when I restarted my computer. The Aero Theme was not. Can anybody tell me how to fix it?
Answer #1
Which version of Vista do you have, mate? And is you graphic card driver updated to the latest one?
Answer #2
Did you install your GPU drivers ?
Is windows experience index calculated ? (To enable aero it should be at least 3) To access it Open the Start Menu and type performance and then select Performance Information and Tools from the search results that appear.
Btw Vista Home Basic doesn’t have aero.
Answer #3
I have Vista Home Premium.graphic Card Driver is installed Index Basic Score 4.8
Answer #4
Try right clicking the desktop, then go to personalize, then under aero themes, click Windows 7.
Answer #5
Try right clicking the desktop, then go to personalize, then under aero themes, click Windows 7.
“Windows Aero” This is vista not 7
Answer #6
Yes I have Vista not 7