This is the correct link: But under XP, the stackwalk is not available. You must have at least Vista to use it. Windows XP doesn't have the required ETW (Event Tracing for Windows) functions. You can make a dump, open it with WinDbg, setup the symbol path, ran the !runaway command to see how long each thread runs, switch to the thread and use kb to show the stack. What is the thread doing?