Unfortunately all attempts fail so far, when trying to use the downloaded blockchain it throws the above mentioned error, als redownloaded it and the same happens, on a clean install of the windows client it also stops at block 18924, exactly the same problem as the linux galaxycoind......
I will try this myself on a separate computer and see how it goes.
From there I will see what instructions need to be added or changed.
FYI--I also just tried after a full Windows 8.1 system reboot to the same error.
Run As Adminstrator also didn't help.