I dont know about the Winlauncher thing, but you could try solution number two at this link. This should fix your problem.
http://www.nonessential.org/2006/06/...ual-core-cpus/
Also, if it dont, try loading Eq and then going to your Task Manager, Click on Process Tab and then right click on your Everquest process and then go to Set affinitly and make sure only one CPU is selected, not both of them.
I use Intel so I have not had a dual core issue like this.