I have done this on VM's using GPart. Allocate more space to the VM then mount the GPart ISO and boot to it ( you will need to access the vm via the console using VI) instructions on how to resize are below
http://www.bleepingcomputer.com/tutorials/tutorial152.html ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~
