Could be because of a previous Install/Uninstall of SQL. If the files that you have Uninstalled weren't unstalled correctly, then it could be that your registry still has them and they are corrupted.
Secondly, make sure you have all your updates, as this could be the cause. If your .Net Framework is out of date, it may be preventing you from installing/setting up the Mssql server.
Hope this has helped.
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