Removing OS from VM Fusion

I want to remove the vists os from fusion and reinstall xp, can't find anyway to remove the os. Tried uninstalling VM fusion but when I reinstalled it showed the same vista OS. Thanks in advance.

if you used boot camp then you can use boot camp to delete the windows partition. If not then im also stuck.

From the Fusion Help:

Deleting a Virtual Machine

If you want to delete a virtual machine, you delete its files using the Finder.

To delete a virtual machine:

1) Power off the virtual machine.
2) Browse to the Virtual Machines folder (usually in your <user>/Documents folder) and select the machine you want to delete.
3) Move the virtual machine package file to the trash.

EDIT: Now, if you don't have a virtual installation, but rather a native install on a Windows partition, you'll need to wipe your partition with Disk Utility, then reinstall XP on the partition.