The four debuggers provided in this package are exceptional tools. In particular, the Kernel Debugger can be invaluable for both fixing rootkits and investigating new rootkit technologies. Many of the difficulties encountered using undocumented Windows internals can also be overcome with this debugger. Unfortunately, this is also a complex utility that requires many hours to master. Fortunately, the Windows Debugger has a complete help system that can walk you through every step. If you are new to kernel debugging, I suggest you start with menu option Help Contents, and just keep reading.