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。
1、开始－＞运行，输入SERVICES.MSC到服务里，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_MACHINE＼SOFTWARE＼ORACLE，按del键删除这个入口；
4、运行regedit，选择HKEY_LOCAL_MACHINE＼SYSTEM＼CurrentControlSet＼Services，滚动这个列表，删除所有Oracle入口；
5、运行regedit，HKEY_LOCAL_MACHINE＼SYSTEM＼CurrentControlSet＼Services＼Eventlog＼Application，删除所有Oracle入口；
6、我的电脑－＞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 Files＼Oracle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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