Installer won't remove windows service

When I try to install over a previous version I get the error "The specified service already exists"

I stop the service before the installation and the services.msc snap-in is closed also.

I use a visu开发者_运维知识库al studio setup and deployment project.

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You need to manually uninstall the service first, see: http://msdn.microsoft.com/en-us/library/sd8zc8ha(VS.80).aspx