Add SQL Server Express to existing SQL Server 2008 installation

I have an installed SQL Server 2008 without SQL Express. I would like to add SQL Express 2008 to the existing server.
How do I go about doing that?

Thanks for your attention.
Charles SugdenAsked:
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ste5anSenior DeveloperCommented:
Download SQL Server 2008 Express and install it.
Vitor MontalvãoMSSQL Senior EngineerCommented:
I'm not sure if you really knows what's SQL Server Express. It's not a feature that you can add to an existing SQL Server installation.

This will be a new completely SQL Server install. You can download the Express edition here.
You'll also need the SP2.
Najam UddinCommented:
When you will install express it would ask about instance to use, there give a separate name.
Charles SugdenAuthor Commented:
When I re-installed my Visual Studio 2010, I didnt install install SQL Server Express.
Then when I was running my MVC4 app my simple membership provider failed.
It took me a while to figure out that I didnt have SQL Server Express installed for it to read the mebership MDF.

Now I am taking another swipe at it.
At first I thought that I could just upgrade the SS 2008 features but I had no luck hence the question.

I guess I was mistaken to think that the SS installation had an option for Express as well.

I am now reinstalling VS2010 with the express option.
Hopefully that will solve the problem.

SS Express 2010 installed seperately but 2008 did not.
Vitor MontalvãoMSSQL Senior EngineerCommented:
I am now reinstalling VS2010 with the express option.
Yes, this can be the right thing to do.

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Microsoft SQL Server 2008

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