No problem with Crimson Edition 15.12 except it took about 8 times to successfully install. It is on an Acer Machine running Windows 10, 64 bit. Graphics Card is a Sapphire Radeon HD5450 1GB DDR3. Everything looked good but it said to install the hotfix and there was a bugfix for one game my son played. Installed Hotfix, rebooted, machine locks up before you can login. Went to Windows 10 version of safe mode. Unistalled the AMD Radeon Controller with Revo Uninstaller deleting all the registry entries and dlls. Rebooted, same thing, locks when you get to the login screen. How can I get back to 15.12 cleanly? Thanks.