Asus G73sw some keys not working

Hello guys, i'm desperate and need your help. Got a problem with my asus notebook g73sw, still don't know where this problem came from. I traveled for 1 month and let the notebook over my desktop table, when i came back and tried to use i could see that some keys weren't working anymore like (fn - also hotkeys like fn + f5 - backspace, A, Q, Z, tab, enter, 4, 5, 6 from numerical keyboard and others..) nobody used it since there was nobody home. I took it to a technician and he told me that the drivers are working good and that i should buy another keyboard to replace. But when i plug an USB keyboard i still have the same problem, if the problem is the keyboard an USB one should work fine, right? I want to know if i should really buy another keyboard to replace this one (i live in Brazil and bought this from BB, there are no selling keyboards here, so ill have to go to US to buy it) or if there's any another fix for this. I'm afraid to buy this new keyboard and it doesn't fix.

I'm actually using virtual keyboard, all keys works fine, except for Fn and its shortcuts.
By the way, i already updated all drives including ATK Pack from asus website.
I thank you all, hope you guys have a fix for me.

 

I would update the ASUS ATK Package with a current version, or at least uninstall it and reinstall.