Do you need to run it with vmware?
I suggest you first set up your partitions using a
GParted Live CD Version 0.3.3 has proper NTFS support. I've used it to shink and expand patitions for Win2K and XP without problems.
When you get to the partitioning stage of the FC6 install select the custom option. Then set up the partitions how you want them, using the spaces you made with GParted. When you get to the BOOT settings have a carefull look at what it is going to do. Make sure it installs GRUB to
hda not
hda1 to make sure it goes in the MBR.
Can you show us the output of fdisk? You can run it from a command line in XP.