I just installed NOD32 antivirus and also loaded the latest graphics driver for Windows 7 and HD Graphics and I did not have any problem with Contrast, Brightness or Gamma settings.
Can you please reply with the model number of your graphics controller?
See here to identify your graphics solution
The graphic controller on my PC is Intel GMA 4500 and on laptop is Intel HD 3000.
Are you use PC or laptop ? What is the spec ?