If you are use oXygen and you uninstall it without uninstalling the SDL AuthorBridge first, you'll get an error when got to uninstall AuthorBridge. Best practice is to uninstall the AuthorBridge first and then the authoring tool. The error is "The specified account already exists." Download and run Microsoft's registry tool. It fixes the problem and it will uninstall AuthorBridge: support.microsoft.com/.../en
Pam Noreault | Knowledge Center Solutions Architect