I'd make a new disk image and transfer all files from the old image to the new in the Finder. At least in VPC 6 you can mount the PC disk images in the finder, I don't know about v. 5. To make a new disk image you choose Virtual Disk Assistant from one of the menys in VPC, and make sure that it's the same size as the old one so everything fits. Then you change the disk image in the "PC settings" in VPC to use the new image.