Can't Find brightness control in Sony AIO computer win7

The computer is Sony VGC-JS190 with Win7 home premiumas the OS.
I can't seem to find the brightness control slider in the usual places like power management, Display etc . My current keyboard does not have the Function keys with brightness buttons like the original Sony KB. Does this mean I need to connect up the old keyboard to perform this ? Is there a Windows control?

It looks like I will have to use the old keyboard just for the brightness control. I was hoping for a sw solution . I did not like the original keyboard because of the colors for the Alt key and character functions. The original keyboard has a lot of alternate characters not normally found in a traditional US because this computer was from Canada .

Will the computer be confused if I temporarily plug in the old kb in a spare USB slot while the current kb is still in place?

Thanks guys.

Connecting back the old Keyboard does not work . Apparently when I upgraded the computer from Vista to Win 7x64, several Sony drivers were not included in the upgrade . I need to reinstall Sony Event Service, Sony Original Function Settings and Sony Shared libraries before the Function Keys will work I never bothered with it because I thought the brightness was fine and I don't use the function keys . However when I passed the computer to my wife she wants a brighter screen.

Does anyone know in what order I should install these files so I can get my keyboard function keys to operate again?

Vaio Event Service , Sony Original function settings, Extension Parser , Sony Shared library .

Thanks

Is there any reason that Event Service need to be last ? There seems to be much discussion which should be first . Apparently the order is quite important .