I also set to eliminate Windows on my Macs (I have two of them - iMac 20' Intel & MacBook) and immediately encountered the same problem. I tried everything I managed to find online - to no avail. Today I paid a visit to a Genius Bar - with the same result (f..... geniuses indeed). The only thing the guy proved to be able to do was reformatting the partition in question in Mac OS, so that now I have two Mac partitions on one hard drive - not much for "geniuses" really. It looks like the problem is inherent to Macs with Snow Leopard, although nobody at Apples is eager to admit that. I just wonder when and who will crack the problem.
I have decided to eliminate my Boot Camp partition running Windows Vista, but when I attempted to restore the partition using Boot Camp Assistant, I got the following message:
Boot Camp Assistant cannot be used.
You must update your system software before using this setup assistant.
I am running Snow Leopard, and there IS no update to the system software! How do I resolve this?
MacBook Pro 15", 2.93 GHZ, 4 GB RAM