Reformatting for a clean install

I want to reformat to have a clean install of XP. I did it before, after being infected with My Doom, but I ended up with double systems. I don't believe I had a clean install. When I attempt it, I am unable to delete the present partition. I was under the impression that the partition needs to be deleted and a new one installed in order to get a clean install. I'd appreciate step by step instructions to clean my entire drive and install XP Home on it. Thanks,
Barry

 

Give this a good read and see if it fits your needs.