I have this problem as well. This happens on two Windows 7 64bit SP1 systems and happens on clean installs of Windows. Unfortunately, it only occurs once every 2-3 weeks. Here's what I see:
On the laptop, the Hamachi client does not show my desktop as being online.
On the system that Hamachi failed to load (desktop):
On the Desktop, clicking Start -> All Programs -> LogMeIn Hamachi -> LogMeIn Hamachi, I get "Failed to connect to the engine."
Services shows "LogMeIn Hamachi 2.0 Tunneling Engine" as "Starting." Bringing up the properties has all the service control options grayed out. The path to executable: "C:\Program Files (x86)\LogMeIn Hamachi\hamachi-2.exe" -s" is in the process table with the matching command line (-s option).
Event Viewer has the following entry:
Log Name: System
Source: Service Control Manager
Date: 4/20/2011 7:49:59 AM
Event ID: 7022
Task Category: None
Level: Error
Keywords: Classic
User: N/A
Computer: Desktop
Description:
The LogMeIn Hamachi 2.0 Tunneling Engine service hung on starting.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Service Control Manager" Guid="{555908d1-a6d7-4695-8e1e-26931d2012f4}" EventSourceName="Service Control Manager" />
<EventID Qualifiers="49152">7022</EventID>
<Version>0</Version>
<Level>2</Level>
<Task>0</Task>
<Opcode>0</Opcode>
<Keywords>0x8080000000000000</Keywords>
<TimeCreated SystemTime="2011-04-20T11:49:59.550911000Z" />
<EventRecordID>13786</EventRecordID>
<Correlation />
<Execution ProcessID="724" ThreadID="728" />
<Channel>System</Channel>
<Computer>Desktop</Computer>
<Security />
</System>
<EventData>
<Data Name="param1">LogMeIn Hamachi 2.0 Tunneling Engine</Data>
</EventData>
</Event>
From Process Explorer, I created a full dump file of the ""C:\Program Files (x86)\LogMeIn Hamachi\hamachi-2.exe" -s" process and analyzed with WhoCrashed (donno what information if any can be determined from it):
Crash Dump Analysis
--------------------------------------------------------------------------------
Crash dump directory: C:\Windows\Minidump
On Thu 4/21/2011 1:17:49 AM GMT your computer crashed
crash dump file: C:\Windows\Minidump\hamachi-2.dmp
This was probably caused by the following module: hamachi_2.sys (hamachi_2+0xBB125)
Bugcheck code: 0x0 (0x0, 0x0, 0x0, 0x0)
Error: CUSTOM_ERROR
A third party driver was identified as the probable root cause of this system error. It is suggested you look for an update for the following driver: hamachi_2.sys .
Google query: hamachi_2.sys CUSTOM_ERROR
Reboot fixes all.
Hope something helps because this problem is driving me nuts.
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