bootcamp won't configure

"The Boot Camp hard disk has been successfully configured, but an unexpected error occured when mounting the selected Boot Camp partitions back to your Mac.

Use Disk Utility to mount these partitions back to your Mac."

My BootCamp works as a separate boot, and I have a volume mounted for the bootcamp partition on my desktop. I can read files from the mounted volume, but I can't write them, presumably because boot camp is an NTFS partition.

Can Parallels Boot Camp support NTFS? What else could be wrong?

John