I want to format my C drive and partitions to install XP again. I haven't done it in a while. So I do the usual step of booting from CD. The install starts but does not give me an option of what drive to install to. It automatically installs to C drive. I tried twice and now I have 3(!) copies of Win XP on my PC to chose between when I start the PC. I just want to format it all and install fresh. How?