Claymore is dead for mining on 4GB cards. If you don't have 6/8GB cards forget about it until it's updated. Windows 7 is a no go as you'll be stuck in graphics mode as AMD never enabled compute mode for its drivers. Download AMD compute switcher to make it easier enabling compute mode on Windows 10.
My RIG 7x4GB cards dead yesterday. Tried every tricks still without life, Claymore is also dead?