推荐回答（1个）
有人想试图用超级兔子或者是优化大师之类的工具清除注册表中与JAVA有关的信息，也有人想自己手动删除它们（不得不说这样做很危险，你有可能使自己的电脑瘫痪），但结果是什么？——还是出现错误警告，想安装新版的JDK安装不了，想删除旧版的JDK却删不干净，束手无策的人在绞尽脑汁之后，唯一能想到的办法就是重装系统。重装系统？这个结果谁能接受？
可以看到这里也有人遇到了同样的问题，看来这个问题出现的范围不小。下面是SUN公司给出的解决办法：
If the normal uninstallation process (as mentioned above) fails, then please try Microsoft Windows Installer Cleanup Utility. This tool will ensure that all irrelevant Java Runtime Environment Microsoft Installer (msi) registries are removed. Detailed information and download is available at: Description of the Windows Installer CleanUp Utility
可以看到，它是让我们去Windows的官网去下载一个所谓的Windows安装清理工具，说这个工具可以将注册表中的信息一起清掉，既然SUN公司都这么说了，那我们只好照办了，下载这个工具之后，就使用它卸载掉JAVA，这个时候你就会发现自己的新JDK可以安装了建议几点：（1）安装JDK的时候尽量将它装到C盘下，因为这里还有系统提供的一些与JAVA有关的文件
（2）要卸载JDK，先用控制面板里的添加/删除程序这个工具，万一删不掉，就使用上面的工具去删。
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