This is documented in the Qt Reference Documentation on Setting up the Debugger.
You'll need to install the Debugging tools for Windows (installing the Windows SDK provides this) which will give you the cdb.exe
debugger. You may or may not encounter an issue when installing the Windows SDK and require this work around: Error when installing windows SDK 7.1
Now, start Qt Creator and go to Tools -> Build & Run -> Debuggers, verify that you now see Auto-detected CDB. Then go to the Kits tab select Manual -> Desktop and change the Debugger value to the Auto-detected CDB.
Now start your project in Debug mode (F5).
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