点击开始-所有程序-Microsoft SQL Server 2008-配置工具-SQL Server 安装中心,然后点击左侧的维护，在点击右侧的版本升级，接着按
点击开始-所有程序-Microsoft SQL Server 2008-配置工具-SQL Server 安装中心
然后点击左侧的维护，，在点击右侧的版本升级，接着按照提示一直点下一步，到产品密钥的时候输入
开发版: PTTFM-X467G-P7RH2-3Q6CG-4DMYB
企业版: JD8Y6-HQG69-P9H84-XDTPG-34MBB
就OK了。
如果以上操作后还提示评估期已过，修改注册表：
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\100\ConfigurationState里的“CommonFiles”值改成3，再重新执行上面的操作。
我重新执行后出现错误：由于登陆失败而无法启动服务
解决办法：控制面板->管理工具->服务，找到MSSQLSERVER服务，右键->属性->登录，选中“本地系统帐户”，确定
是不是改密码了？
估计是用户名和密码有差错,现在用本地系统帐户就可以了.
SQL Server 1069 错误（由于登录失败而无法启动服务）解决方法
1.
我的电脑--控制面板--管理工具--服务--右键MSSQLSERVER--属性--登陆--登陆身份--选择"本地系统帐户"
或:
2.
我的电脑--控制面板--管理工具--服务--右键MSSQLSERVER--属性--登陆--登陆身份--选择"此帐户"--密码和确认密码中输入你修改后的administrator密码.
两者的区别:
选择第一种方式,以后修改了administrator密码,不用再调整(但要求登陆操作系统的是系统管理员)
选择第二种方式,以后修改了administrator密码,还要再重复做上面的操作.
PS:完成后必须重启下SQL SERVER。我是用的第一种方法。
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