The two most common debug kernel errors are 1 and 3.  Debug Kernel error 1 indicates that a module needed by a program cannot be found. Usually, this means that a DLL required by the program is not where it is expected to be on disk.  Check directory and path.

Debug Kernel error 3 indicates that the program being debugged is already running.  This can happen by pressing Trace or Step twice very quickly particularly under NT, trying to run an app through the IDE that is already being run through the IDE, etc.