I have had multiple problems in getting Parallels to work on my Mac Pro. My machine four hard disks installed. One for Macintosh Hd, one for Macintosh data, one for Windows XP, and one for Windows data. Boot Camp uses Windows XP Pro installed on the Windows XP drive. After I install Parallels, I get a window stating that Parallels stopped unexpectedly. If i restart it, a Parallels window comes up showing that the virtual machine is stopped. If I go to Actions -> Start, I get the following message: More than one Windows partitions are found. This is not a standard Boot Camp configuration. Please refer to the Parallels Desktop for Mac User Guide, Using Boot Camp Windows XP Installation chapter for instructions on how to configure Parallels virtual machine in case of non-standard Boot Camp configuration on your Macintosh computer. I have not been able to find the referenced information, Another problem is that the User Guide says that I must register Parallels at http://www.novareg.com . I have been unable to connect to this site. As of now, I am completely unable to use Parallels on this machine. I have another copy of Parallels installed on a MacBook Pro without Boot Camp installed. It works very well.