download the drivers you used to have separatly, boot in safe mode, use DriverSweeper to completly remove all your ATI drivers and software, then reinstall from scratch, using the mentioned archived pack.
Guru3d stopped carrying it but its still out there -try company site and CNET as I picked it upa few weeks ago having similar issues with the 7970 (which I returned). Also, grab ATIman Uninstaller -and use this in Normal mode after your done with Sweeper in Safe mode. Should clean it out for ya.
It's the actual developer's website. Any download you might find anywhere else (especially on Guru3D) is out of date.
To find old drivers: Go to the ATI website (http://sites.amd.com/us/game/downloa...downloads.aspx) and click the link for your operating system. After that, go down to the bottom of the information box where it has a small link for "previous drivers". Go there, and it has a list of every driver available, just click on the name to go to its download page. Just make sure you don't go too far back, some drivers might not support the 6000 series, because they were developed before the 6000 series was released.
If you installed any application profiles, uninstall those BEFORE you uninstall the actual drivers. Uninstall both the application profiles and the drivers you are currently running through the Control Panel/Add & Remove Programs panel. When asked during the driver uninstallation, choose "Express Uninstall ALL ATI SOFTWARE". After it's finished it'll ask you to reboot, do so. After it's rebooted, make sure you have the driver you want to install already downloaded. Then, reboot into safe mode (if you don't want to mess with jabbing function keys just go to start, and then in the text box type "msconfig", and the boot tab will have an option for safe mode). Once in safe mode, run driver sweeper (as administrator) and check the box next to "ATI - Display" or "AMD - Display". You only want to clean DISPLAY software, don't make the mistake of checking everything for AMD/ATI and then wondering why your chipset drivers are gone. After that, hit the button that says Clean, and wait for it to finish, it will ask you to reboot, do so. Then, reboot out of safe mode (simply go back to the msconfig tab and uncheck the safe mode option). After that, I suggest you make a restore point, then reboot again, and then install your new drivers.
I purchased my 6970 (I actually have 2 of them now, not that crossfire seems to work that well with Arma 2 anyway) and I wish I hadn't.
Arma 2 is the only game that I really wanted to get running well and I haven't been able to - I have an i5 2500k oc'd to 4.3 Ghz
Problems, ok where do I start...
I can't use AA in game or I get white pixels spread throughout the trees and bushes. I get significant fps drop when looking through scopes and then I get flickering of buildings/textures when looking at them through a scope. Oh yeah and then if I do manage to achieve a reasonable frame rate the lighting starts blindly flickering white util the entire screen is white and I can't see! (not being able to see kinda makes it a bit unplayable)
From what I have read people with ATI cards seem to have started getting problems when upgrading their drivers from 10.10 to anything later. Unfortunately there is no support for 6970 using 10.10's (I think support was added sometime around 10.12)
IMO there is something not quite right with the memory setttings in Arma 2 and my 6970. From what I have read, there seem to be quite a few people out there with 6000 or 7000 series ATI cards that are having similar problems.
Sorry for the rant but if it was me, I would return that card and buy something else.