karlfranz,
Since you are FAT32 on your Bootcamp partition, I suggest you make a Disk Image of it in OS X's Disk Utility, then erase your bootcamp partition, make a new one, restore your Disk Image by opening it up and dragging the contents over to the Bootcamp partition to restore all your files, and then see if Parallels will open it.
You might even want to see if Parallels will use the Bootcamp partition after you re-format it, and before you drag all your files back over. As long as you keep your partition formatted in FAT32, you'll be able to restore your old system by drag and drop. (you won't be able to restore the disk image through Disk Utility's "Restore" process if your partition is larger than 4gb, but you can drag and drop the file individually from the Disk Image in the Finder with no problems.)
At least by doing this you'll know if something is wrong with file system that Parallels doesn't like.
I also have a great way to backup and restore your Bootcamp partition to NTFS, but it involves a more detail process, if you've thought about converting your current system to NTFS and keeping all your installed stuff.
Also, if you have installed Tools for Bootcamp natively, make sure that has been uninstalled natively from Bootcamp.
Last edited: Jan 18, 2007