I've moved this post to its own topic. This will stop the other topic you posted in getting confused, and means you can be sure any replies are specifically for you
I'm afraid I don't have the answer, but perhaps someone else will.
You can start by checking in your main PC Specialist account for the Downloads section, in case there is the software there for you to download.
You need to make sure Gaming Center is installed to your machine for this, you can change the colours on this program.
You will however need to re-open the software every time you turn the machine back on, at least i do as it does not open on start-up meaning it will revert to default.