Replaced HDD and SW update drivers are bad

Hello, I own the NP355E7C-S01HK with A10 4600m and 7660g + 7670m (512mb + 2048mb vram).
My HDD stopped working months ago, so I replaced it.
I lost the stock drivers.
I tried a lot of versions and combinations fro AMD website, they simply don't work well.
I also tried SW update drivers on every OS (7, 8 ,8.1) and they were bad either (really bad).
I spoke with samsung, they did a new version but the new version doesn't work well too
(it works, playable but not like it used to).
I found this videos:
https://www.youtube.com/watch?v=zmmP_2lmy5c

https://www.youtube.com/watch?v=cLW4OXGT50Y

I couldn't bring better example for the way my laptop worked. this is the exactly same performance of my laptop
(on 900P, but without recording so the performance are about the same) .
The performance dropped by 30 - 70%!
That's make some games unplayable.
Sometimes, even if the game is on "ultra" and playable, it not looks like "Ultra".
The stock drivers disabled the crossfire automatically
(the pc showed he has 2 cards but he used one card, but not the 7670m, the 7660g, I assume that's 512mb vram GPU can't run BF4 on ultra, so he probably used the 7670m for games and 7660g for low power stuff, anyway I don't really know what it did I just know the PC behave there is one working gpu at a time).
Edit- I played Shadow of mordor and it says (CFX disabled) I have 7660g with 2560mb (2.5gb) like they work as one card.
Please help.
Thank you.