For "Object already exists" or "Access denied" errors when installing try opening Control Panel > Programs and Features > View installed updates then checking for Security Update for Microsoft Windows (KB2918614). Uninstall if you have it, then reboot and try installing again.
解决delphi安装出现内部错误的办法！（所有安装都有这个问题）
原文：http://www.cnblogs.com/prtmon/p/4159099.html