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－＞ UniversalInstaller 卸装所有Oracle产品，但Universal Installer本身不能被删除 5、 运行regedit，选择
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－＞ UniversalInstaller 卸装所有Oracle产品，但Universal Installer本身不能被删除
5、 运行regedit，选择HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE，按del键删除这个入口。
6、 运行regedit，选择HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services，滚动 这个列表，删除所有Oracle入口。
7.运行refedit，HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Eventlog\Application， 删除所有Oracle入口。
8、 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
9、 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
10、 删除\ProgramFiles\Oracle目录
11、 重新启动计算机，重起后才能完全删除Oracle所在目录（到这基本可以安装 ）
12、 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Windows2000目录（一般为C:\WINNT）下删除以下文件ORACLE.INI、oradim73.INI、oradim80.INI、oraodbc.ini等等。
13、 WIN.INI文件中若有[ORACLE]的标记段，删除该段
14、 如有必要，删除所有Oracle相关的ODBC的DSN
15、 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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