I had the same problem in the past.
Not sure if I posted in the forum or in a ticket about it.
If you had .net 3.5 installed and then installed an SQL server, I had a problem with the SQL server starting up.
Once the SQL server is installed, I think I had to reinstall .NET 3.5 afterwards, and I think I also installed .NET 4.0 and the SQL server started working fine.
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