- Stop the LogMeIn Hamachi2 Service (go to task manager, select the services tab and find the hamachi2 service, right click on it and press stop service.)
- Delete the LogMeIn Hamachi folder in C:\Documents and Settings\LocalService\LocalSettings\Application Data (alternatively, you can go to "run" in windows xp or go to the search box on the start menu in Vista/7 and type in %appdata% then click enter.)
- Restart the LogMeIn Hamachi2 Service (do the same as first step except this time instead of selecting "Stop Service", chose Start Service"
- Start Hamachi
If that still doesn't work, try this:
Delete your Hamachi LogMeIn from your PC, every single file, folder.. then press START>RUN and enter this text : %APPDATA% , press enter and find a file named Hamachi. Delete it too. After that reinstall your Hamachi program and it should work properly. Good luck.