Yes.

I have just realised what you said earlier - you have gone to a 100M disk.

The builder doesn't work correctly for this size disk. I recall the symptoms you are now describing happened to me twice this summer on 80G disks.

What you have to do is install the developer version after the builder has run on the disk, then read the article by Roger Lipscombe on his home page (I forget where it is now - www.differentpla.net?). You then manually chop up the disk some more, then blow the normal 2.0 consumer final.

This is complex. If you are already having trouble upgrading at the moment, you might not be able to handle this yourself without help, and a lot of patience on your part. You VERY definitely need to keep your cool while doing it.