I'll guess one of these three things is causing your troubles:
1) Wrong driver - try another one and/or check the Windows Device Manager for errors.
2) Wrong writing program - I mistakenly tried to use one in the CDs main folder rather than the correct one, which was buried in a sub-folder. I use the 'Neo Power PCE USB Writing System', but maybe the 128mb card with save feature uses a different one (mines a 64mb card).
3) Inadequate card insertion - I had to be quite forceful the first few times and really shove that sucker in.