This can happen if another program corrupts your Hamachi configuration or identity information.
To fix whatever corrupted your configuration,
Click Start, then Run.
Type %APPDATA% [hit Enter]
Rename the Hamachi folder.
The next time you start Hamachi, it will connect as if for the first time, but the issue should be resolved. Note that me> refers to the Windows username that Hamachi was installed with.
3/12/2012 1:00 PM