Hard drive and Startup problems

I was trying to format my brother's hard drive in a new format. So I unhooked one of mine, in my computer, and put in his. Then I tryed to install XP on it. Once that was done, I replaced mine and took a break.

Now, Whenever I start my computer, It says something like, "Secondary hard drive not found""Press F2 to continue, Press F12 to run setup utility"
If I press F2, It gets me to a screen to choose my operating system, of Which I have 3(they all say XP and only one works) to choose from. Before, when I had 2, It gave me 30 seconds to choose. Now it gives me about one or two before restarting. I have no viruses. I thank you in advance for your help

 

I managed to fix the secondary hard drive thing, But it still has the same problem choosing the operating system.

 

I fixed the problem. It is actually pretty easy. It was hard tofind though. Allow me to quote someone, "Ok, heres a quick and easy way to get rid of that menu. Open up your system properties, click on the advanced tab. At the bottom click on Startup and Recovery. Now you can select which is the default OS that will boot up. At the top of that dialog box you can make that choice. When your done that, just uncheck the box labeled Display list of operating systems for........ and thats it. Choosing your OS at bootup shouldnt happen instead it will just boot up what you selected for default."

That fixes it well