My graphic card is ati 7870 sapphire 2 GB. Win 7, PC (not laptop)
SInce last two updates, i can't watch hd videos anymore, they freeze then continue (every half second). After the first update, can't remember the number (one before 15.7.1) i saw i couldn't watch any hd videos again so i waited for a fix to come out or a new version with the fix in it. And now i updated to 15.7.1 and its all the same.
So i tried to uninstall and install again, followed the instruction (uninstall manager, safe mode, use ddu, reboot, disable every antivirus, install) and it was the same again.