Question: I just reinstalled Windows 7 on my Dell Inspiron 15R SE 7520 and I'm trying to get the dicrete GPU selected. But even though I got the High Performance option selected on Catalyst Control Center, I can't get Skyrim to run on the discrete GPU. How can I get it working?

EDIT:
I forgot to mention this is a hybrid GPU, it needs the on chip intel one to perform in any level... IMHO, a crappy design.

Answer: 
No guarantee to work (don't have a onboard card to test), but I'd assume the following should work:

* Go to `[my documents]\My Games\Skyrim` and open `SkyrimPrefs.ini` with your favorite text editor.
* Look for a line starting with `iAdapter=`. Actually it should state `iAdapter=0`. Change it to `iAdapter=1`.

Try launching the game again, avoid going into the launcher's settings.
Don't blame your onboard gpu it comes in handy if you're on the road and don't want to waste a lot of power.

But concerning your question: Start your Skyrim launcher and then there should be the bullet point 'Options' which leads you to the graphics settings.
The first dropdown list there should be 'Graphics Adapter' if this isn't the case, try this [link to a dell forum thread](http://en.community.dell.com/support-forums/laptop/f/3518/p/19474269/20221062.aspx#20221062 "this link") about a similar problem with a Inspiron 14Z.

\*add\*:
Also one tip from there was to ensure you don't have a old GPU that lacks the power so try to uninstall your Radeon Driver and start the game. If the performance is even worse you know what to do. Use [fraps](http://fraps.com) and determine the frames per second to see the performance drop and if there is one.