Boot Camp-Partition from Hard Disc will not supported

My Mac-Pro have 4 S-ATA Hard Disks inside. The smallest is for Windows XP.
If i am starting Paralles 5 for Windows XP with the bootcamp particon the fault message "the Boot Camp-Partition /dev/disk0s2 from Hard Disc 1 will not supported". If I configure the Hard Disk in the Parallels Desktop V 5.0 the program works. What can I do, that Parallels make it alone.
I did from forum "Cannot start VM after Upgrade to Parallels Desktop 4.0 for Mac. Receive "Unable to connect Hard Disk " error. What should I do?"
I also resetet my networking configuration (kb.parallels.com/en/5791)
but this way do not help on my Mac.
Thanks
Sorry for my bad english