hi, I have HP Pavilion dv6 notebook, Core i5 processor, 4 Gb ram, ATI mobility Radeon Premium graphiv card with Windows 7 Home installed. I wish to upgrade to Windows 7 Ultimate while preserving the HP utilities like like "Configure switchable graphics" with which I can select either the intel power saving Gpu or the ATI high performance Gpu. Kindly inform how to do it and your advices.