Plz follow progress belowed step by step, you will uninstall oracle sucessfully:
1、程序(All Programs) -- Oracle-OraClient10g_home1/2 -- Oracle Installation Products -- Uninversal install -- Deinstall Products
2、start -- Run -- regedit --
HKEY_CURRENT_USER -- Software -- delete Oracle
HKEY_LOCAL_MACHINE -- SOFTWARE -- delete Oracle
HKEY_LOCAL_MACHINE -- SYSTEM -- CurrentControlSet -- Services -- delete Oracle
3、delete oracle directory, eg. c:\oracle
刪除oracle在安裝時默認生成的目錄，一般在c盤下。
4、delete oracle Path of environment variable
My computer -- Properties -- Advanced -- Environment Variables -- Path
delete all the paths which including 'oracle'，
我的電腦 -- 屬性 -- 高級 -- 環境變量 -- Path
刪除裏面含有oracle的路徑
5、delete ORACLE_HOME if exist（刪除ORACLE_HOME ）
6、After restarted, delete the installational directory of oracle
重啓後，刪除安裝oracle的目錄，如：d:\oracle
That's all.