[ubuntu] ubuntu can't hang up

Respect The Ubuntu Team:
When I want to hang up ubuntu12.04 appear:"There is not enough disk space to save the virtual machine state. Free an additional 780.4 MB and try again.Unable to save file 'C:\Users\Administrator\Documents\Virtual Machines\Ubuntu (4)\Ubuntu (4)-9a4c43ea.vmss'.Failed to suspend the virtual machine: Insufficient disk space."How can I do to solve this problem.


Tanks everyone.
I am Alicce.