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It appears there may be another APM tool installed on the machine. Since there can only be one .NET profiler configured at a time, you will want to be sure to uninstall whichever tool is there and then rerun the AppDynamics .NET agent installer.
If you are unsure of which APM tool is currently installed, you can run the following command in the Windows Run tool to launch the Environment Variables editor and check the value that is stored in the COR_PROFILER variable.
With that value, you should be able to run a quick web search to see which tool that profiler ID is associated with.