[[AMD Radeon] Crash on boot with latest AMD drivers]

I have Radeon 6850 and the same issue is happening to me  

[Viewer crashes after log in]

Hi there. I can't get into the game because it crashes everytime. I loads till I see the world, but it crashes few seconds later and the crash logger appears. I tried updating the drivers of my graphic card, but that didn't work. I tried uninstalling and installing the game again, didn't work either. I tried with older and beta viewers but all of them crash. I tried cleaning the cache files too, I don't know what else I can do.

Could it be a compatibility issue with my graphic card?

Here they are my PC specs:

CPU: Intel(R) Core(TM) i5-2320 CPU @ 3.00GHz (2993.25 MHz)
Memory: 8158 MB
OS Version: Microsoft Windows 7 64-bit (Build 7600)
Graphics Card Vendor: ATI Technologies Inc.
Graphics Card: AMD Radeon HD 6800 Series

Windows Graphics Driver Version: 8.17.0010.1236
OpenGL Version: 4.2.12441 Compatibility Profile Context 13.200.11.0

libcurl Version: libcurl/7.21.1 OpenSSL/0.9.8q zlib/1.2.5 c-ares/1.7.1
J2C Decoder Version: KDU v7.0
Audio Driver Version: FMOD Ex 4.44.12
Qt Webkit Version: 4.7.1 (version number hard-coded)
Voice Server Version: Not Connected
Built with MSVC version 1600

Any help will be really appreciated! Thanks