很多朋友只用了Oracle的删除，但很多情况下，他会发现重新安装时，点了下一步安装界面就消失了，往往无奈下只好重装系统，其实只是你数据库没删干净，删干净就不会出现这种情况了。 实现方法： 1、开始-设置-控制面板-管理工具-服务停止所有Oracle服务。 2、
很多朋友只用了Oracle的删除，但很多情况下，他会发现重新安装时，点了下一步安装界面就消失了，往往无奈下只好重装系统，其实只是你数据库没删干净，删干净就不会出现这种情况了。
实现方法：
1、开始->设置->控制面板->管理工具->服务停止所有Oracle服务。
2、开始->程序->Oracle - OraHome81->Oracle Installation Products->Universal Installer卸装所有Oracle产品，但Universal Installer本身不能被删除。
3、运行regedit，选择HKEY_LOCAL_MACHINESOFTWAREORACLE，按del键删除这个入口。
4、运行regedit，选择HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServices，滚动
这个列表，删除所有Oracle入口。
5、运行refedit，HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesEventlogApplication，删除所有Oracle入口。
6、开始->设置->控制面板->系统->高级->环境变量,删除环境变量CLASSPATH和PATH中有关Oracle的设定。
7、从桌面上、STARTUP(启动)组、程序菜单中，删除所有有关Oracle的组和图标。
8、删除Program FilesOracle目录。
9、重新启动计算机，重起后才能完全删除Oracle所在目录。
10、删除与Oracle有关的文件，选择Oracle所在的缺省目录C:Oracle，删除这个入口目录及所有子目录，并从Windows 2000目录(一般为C:WINNT)下删除以下文件ORACLE.INI、oradim73.INI、oradim80.INI、 oraodbc.ini等等。
11、WIN.INI文件中若有[ORACLE]的标记段，删除该段。
12、如有必要，删除所有Oracle相关的ODBC的DSN。
13、到事件查看器中，删除Oracle相关的日志。
说明：
如果有个别DLL文件无法删除的情况，则不用理会，重新启动，开始新的安装。安装时，选择一个新的目录，则，安装完毕并重新启动后，老的目录及文件就可以删除掉了。
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