SQL Agent keeps stopping

I am trying to install MS Dynamics but the SQL Agent in my SQL 2012 will not stay running.
I start it and it stops/
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Ganesh Kumar ASr Infrastructure SpecialistCommented:
Okay try this from

To start the SQL Server Agent service
On the Start menu, point to All Programs, point to Microsoft SQL Server 20xx R2, point to Configuration Tools, and then click SQL Server Configuration Manager.
In SQL Server Configuration Manager, expand Services, and then click SQL Agent.
In the results pane, right-click any instance, and then click Start.
A green arrow on the icon next to the SQL Server Agent and on the toolbar indicates that SQL Server Agent started successfully.
Click OK.

Also check the sql server agent event logs
Vitor MontalvãoMSSQL Senior EngineerCommented:
What's the error?
By the way, if you're using SQL Server Express Edition, the SQL Agent isn't available.

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