Esse! I have no Effin idea why this works, but it works like a dream.
Thanks for sharing
1) Kill the process "hamachi-2.exe"
2) Disable and enable the hamachi network adapter (Control panel / Network)
3) Start again the service "LogMeIn Hamachi 2.0 Tunneling engine" from the control panel / Services (Run Services.msc)
4) Start the Hamachi client from the Start menu"