Hello usama,
I haven't been able to get the Fn key software installed so maybe that is causing the issue, but there is a minor complication with that theory. I have two notebooks (Sony SR240 & SR290) with Win 8RP installed. They are "almost" identical, with the only difference that I am aware of being the SR240 uses an Intel graphics chip and the SR290 has an AMD graphics chip.
Same CPU's, same amount of memory, same chipsets. The SR290 doesn't have the exclamation point but the SR240 does.
Still, that doesn't mean the Fn driver software isn't the issue though. I'll play around with different compatibility modes and installation sequences and see if I can get the drivers installed.
Thanks,
Ed