It sounds like you’ve tried several steps without success, and I understand how frustrating this must be. To better assist you, could you please specify which exact steps you followed to remove the redirect? Also, did any of the spyware programs find anything suspicious? It would be helpful to know if this issue started after a particular event or change on your computer. Finally, please let me know which browser you are currently using where you see this redirection to Yahoo through search-great.com. This information will help in diagnosing and resolving your issue more effectively.