If you are not able to follow the steps and the installer appears, I would suggest uninstalling SQL completely, I would suggest using

<--- Link to download, so that when you uninstall your engine, you can also delete all of the registry entries it made on the installation, then reinstall it from scratch, and if the issue persists, then follow the four steps mentioned above, or if you have an old version of SQL, upgrade to -at least- SQL 2008 R2 (which has this issue fixed according to microsoft)