VDroop is an event. When your CPU is running at full load, the regular idle voltage usually drops a little bit. This drop is called the VDroop. I think there's a term for the drop between BIOS VCore and idle VCore. Maybe VDrop?
Well go into the BIOS and simply see if you can change it. If you don't have an option then you can't change it (duh right :P). It's OK though. Try to change all the settings that you can from the list I gave you. Don't touch the Frequency or VCore yet.