Here's how to get Haiku to work in Parallels:
- Download a nightly build from the Haiku Build Factory.
- Rename the "haiku.image" file to "haiku.hdd".
- Use ImageTool to resize the haiku.hdd file to 120MB.
- Create a new VM in Parallels, with Guest OS Type as Windows.
- Set the Hard Drive to the haiku.hdd file that you downloaded.