Formatted Dell Laptop, reinstalled Realtek Audio Drivers but noManager

I bought a 27" monitor, keyboard and Logitech 5.1 Surround Sound System for my laptop; the only thing I can't get to work are my 5.1 Surround sound speakers.

5.1 requires 3 audio ports (as you probably know) but only two of mine work; consequently only either the rear speakers, front speakers or middle speaker can work at the same time. (It only likes to use one port at a time due to the current issue, it's either 2.1 or 5.1, not halfway) My third audio port is a mic port, but I've heard that using Realtek HD Audio Manager you can retask this port to act as an audio output port.

However after formatting my laptop months ago I have the Realtek drivers but not the manager, I can't find any downloads for the manager on the internet, they all appear to be driver only.
IMPORTANT: my soundcard is meant to support 5.1; when I go into device manger and sound properties it says so.
Thanks for reading, is there anything I can do? Or can I only use two speakers?

Thanks, I have a two years old Dell Studio 1745. When I go into control panel, "uninstall programmes" I can see "RealTek HD Audio Driver" which I downloaded from the realtek site, but it clearly said "Driver Only". I need the manager I think, but I don't know where to get it.

Thanks a lot in advance.

You likely need the Dell supplied drivers to get all the features working.