.NET Reflector Support: How do I stop .NET Reflector from asking me to locate assemblies all the time?

Open up .NET Reflector and go to View > Options on the main menu. Now click on Browser in the list on the left, and then check Automatically resolve assemblies. Click OK, and the prompt should go away. Bear in mind that if you have multiple assemblies with the same name and version number, .NET Reflector may struggle to resolve the correct assembly.