Please try the steps below to see if it resolves the issue.
1. Run the Windows self check tool to check scan and automatically repair any corrupt files found in Windows. There is a guide on how to do it here. What you need to do is run an elevated command prompt (elevated means run it as administrator) and type SFC /SCANNOW. This will generate a statement indicating if errors were found the Operating system and if they were fixable.
3. Update Windows. Install all available critical, recommended and optional updates. Often Netframework and Visual C are included in the recommended or optional updates Windows provides. Windows should always be fully up to date before installing our drivers!
4. Use DDU to sweep the system of AMD drivers.
5. Install the latest Crimson 16.5.3 drivers once the above is completed.
Thanks for your help those are the steps i tried several times wihtout success.
I made a clean installation of windows now and it installed Crimson 15.11 now. I wasn't able to install a driver manually even with a clean installation (freeze during progress) but i think my video card is fine since it flawlessly install under any other operating system.
I dont think im gonna touch anything now and will just take what works.
Though im gratefull for your help.