When I installed the Qt creator on windows, I changed my compiling tool chains such that I used gcc and gdb of my own MinGW/MSYS installation. However, while debugging I used to get this message:
"the debugger could not load the debugging helper library"
You can fix this if you use the python based debugger (QtCreator: Tools -> Options -> Build & Run -> Tool Chains), shipped with the QtSDK. On my installation (I think its the standard path) I find it here: