No right-click context menu for Erase heh? Well it is there with v5.7, so who knows what happened with your own individual setup.
A suggestion might be to add the context menu entry yourself manually to the registry. To to this, copy and paste the text below into Notepad, and save it as a registry merge file (*.reg). For instance you could save it as "Erase Right Click.reg" or something similar. Once you do that, just double click on the *.reg file to merge it with the registry, then reboot your PC for it to take effect.
-Begin Cut and Paste Below-