以前装过sql server，后来删掉。现在重装，却出现“以前的某个程序安装已在安装计算机上创建挂起的文件操作。运行安装程序之前必须重新启动计算机”错误。无法进行下去。
卸载SQL Server2000或者安装过3721等软件之后，如果再重装SQL Server的话，有的时候会出现“以前的某个程序安装已在安装计算机上创建挂起的文件操作。运行安装程序之前必须重新启动计算机”的提示，参考了一下网上的资料，
解决方法如下：
打开注册表编辑器，在HKEY_LOCAL_MACHINE＼SYSTEM＼CurrentControlSet＼Control＼Session Manager中找到PendingFileRenameOperations项目，并删除它。这样就可以清除安装暂挂项目。
参考网上资料，总算搞定。步骤是：
1）添加/删除程序中彻底删除sql server。
2）将没有删除的sql server目录也删除掉。
3）打开注册表编辑器，在HKEY_LOCAL_MACHINE＼SYSTEM＼CurrentControlSet＼Control＼Session Manager中找到PendingFileRenameOperations项目，并删除它。这样就可以清除安装暂挂项目。
4）删除注册表中跟sql server相关的键。
其实估计只要做第3步就可以搞定，这样就可以清除安装暂挂项目。自己是先走了1，2，4，最后做了3才搞定。所以估计3才是最关键的
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