It really should not have anything to do with the res fix or ShIII.
Or does any of the mods you mention alter the ntdll.dll?
Have you uninstalled any other program lately?
A wild shot, try to run Windows Update. This .dll file have been updated at least two times, maybe you could get the latest update to run again?
Its 0300 in Sweden so I am going to sleep now, god luck.
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