Under Win 2K with service pack 4.
I had a problem flashing the official NEC firmware. It would get to 2 blocks and then stop and report “Flash error”. I closed every application etc. and still no go.
Previously I had tried various windows flashers provided by third parties and none of them worked either.
So today I booted into Safe mode and tried again. Now it worked. Yay!
Maybe someone else is having this problem, and this will work for them.