Sample Exchange Setup Log III:

[8/12/2010 2:59:38 AM] [1] [ERROR] Unable to remove product with code 24b2c164-de66-44fe-b468-a46d9d5e6b31. Fatal error during installation. Error code is 1603. Last error reported by the .msi package is 'Could not open key: UNKNOWN\Components\C4DF6B15155640110AF18C3B9B1A1EE8\461C2B4266EDEF444B864AD6D9E5B613.   Verify that you have sufficient access to that key, or contact your support personnel. '.

Missing registry permissions on:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Components\<GUID mention in the error log>.

P.S.  I will continue adding more errors and solutions to this post...

如果注册表过多的话：

Could not open key: UNKNOWN\Components\xxxxxx...错误解决方法

1. 依次点击：开始，所有程序，附件，右键单击命令提示符，选择以管理员身份运行。2. 复制或手动输入下列命令：secedit /configure /cfg %windir%\inf\defltbase.inf /db defltbase.sdb /verbose。3. 待运行完成后，重新安装即可。

还有：

在安装Exchange 2010至本地Win7系统时，提示报以下错误,“上次安装后还没有重新启动。请重新启动系统并重新运行安装程序”