Sign into itunes store and into Match. You will be asked to add this computer. Match will scan your library and then display all you music that you have in imatch.
Each track will have download symbol when you view library in song view. Therefore you can download and store on your computer.
It is also a good idea if you also create a backup on an external drive if you already have one. Don't rely on the cloud as your sole back up.
Thanks for replying, so as I have 9000 + songs I have to down load each song again from my icloud, is that right, you say about creating a back up, when would I do that? when I ask to download each track, would it save it to my PC then? If so just create a folder on my hard drive and have everything downloaded to that. Or do I ahve to do it after they have been downloaded from my cloud?
When you download the tracks they are saved in your itunes library on your PC - itunes creates default folders. i see no reason to change this.
Once download you can back up your downloaded music to an external hard drive.