In the USA it's 1800SAMSUNG
And we have a Samsung rep over at the CNET Samsung Forum.
But if it's just that, I'd do another reboot before I went looking for the little helper app that provides that feature. Remember it's not a Windows 7 feature but an addon. I've found malware, registry cleaners and more to kill off this helper app.
I only have a rc512 and rv515 to compare with but reading http://www.sammynetbook.com/forum/threads/13490-Fn-keys-for-brightness-adjustment-not-working I think I see the same Samsung Easy Display Manager here.
Look for that.