打开registry editor
打开[hkey_current_user\software\microsoft\internet explorer\searchscopes]
把DefaultScope的值(类似{4BC0C4F8-E7D9-44CF-AE0B-2688E7BF4873})清空,删除与那个值同名的子文件夹
如果提示不能编辑,点registry editor的edit->permissions...,把your-computer-name\your-user-name或者Everyone的权限改成Full Control
改完关掉registry editor,进IE设定你喜欢的default search provider
改注册表风险很大,小心!