What you are seeing is...
...the Windows 7 boot manager screen. Since you installed Windows 7 as a dual-boot after you had Windows 8 installed, Windows 7's boot manager is in control of the process.
When you install Windows 8 as a dual-boot on a Windows 7 machine, Windows 8's boot manager is in control of the process. Windows 8's boot manager has a color and better looking graphics as opposed to the basic black and white of Windows 7's boot manager.
Now, in the case of a "Windows 8 dual-boot on a Windows 7 machine" I know that if you choose to make Windows 7 the default operating system, the boot manager changes and the boot manager screen goes to black and white.
A similar change could ocurr in the case of a "Windows 7 dual-boot on a Windows 8 machine". I haven't tried this scenario, so can't say for sure. Try changing the default operating system to Windows 8 and see what happens.
