If you absolutely must use the HD 4890 on Win10 64-bit:
Step 6 — Use Microsoft Basic Display Adapter or generic drivers if all else fails If neither legacy nor modded drivers worked stably, Alex reverted to the Microsoft Basic Display Adapter for reliable output and accepted reduced performance. For light tasks, this was acceptable; for gaming, Alex considered a newer GPU. ati radeon hd 4890 drivers windows 10 64bit new