How do I stop windbg from being the interactive debugger?

Question

What is the proper way to undo windbg -I on vista/win7?

Is it as simple as deleting the registry keys in HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\C

Answer 1

You don't need to delete the entire registry key. Deleting the Debugger value is enough.

When an exception occurs, the system first looks to see if there is a debugger registered. If so, it just launches the command line specified. Otherwise, it invokes Windows Error Reporting to collect the crash dump. All Windbg -I does is change the registered debugger value in the AeDebug key.