In my MSI installer custom-action handler (done with C++) I cannot obtain the SE_DEBUG_NAME privilege to be able to open and terminate a process, thus I have to resort to do
Official error code documentation is at:
http://msdn.microsoft.com/en-us/library/windows/desktop/ms681381(v=vs.85).aspx
Unfortunately this covers ALL windows error codes, which may well be shared between applications.
However the two you mentioned above are on there. For example, 128 is listed as 'There are no child processes to wait for.'