What would be the step by step action so that I can log in to yahoo, im using windows vista.?

How would I change the firewall to make yahoo messenger compatible to windows vista?What would be the step by step action so that I can log in to yahoo, im using windows vista.?Go back to Windows 98. Best OS ever!What would be the step by step action so that I can log in to yahoo, im using windows vista.?You don't have to go in all these step by step procedure if you use Windows 98/2000/XP. Windows Vista is not a good OS. It has many problems. It is worst OS produced by Microsoft.