Run in compatibility mode for WinXP.
Thanks Mylenium. Already done, as well as updating dw8_801_update_it.exe (working) and dw8_802_update_it.exe (not working)
That's a Windows system error, not a DW error. NTDLL.DLL is a core system file. You may need your OS disc handy for this one. Open up a Command Prompt window and run:
Or Windows 7 may have a repair option on the disc now. Either way you have to repair/reinstall OS.