unistall sql server 2005
Not sure if it will solve your issue but you can try something like this:

start /wait &lt;CD or DVD Drive&gt;\setup.exe /qn INSTANCENAME=&lt;InstanceName&gt; REINSTALL=SQL_Engine REBUILDDATABASE=1 SAPWD=&lt;NewStrongPassword&gt;


See more at: https://technet.microsoft.com/en-us/library/ms144259(v=sql.90).aspx