I just upgraded my laptop with Vista Home Premium and it works great. I chose to do a clean install as I already had backups of all my files. To my surprise the clean install option did not opt to reformat or partition my drive. Instead it backed up my old windows and installed vista on theI current partition.

My question: Would it be preferrable to leave me system as is considering it works fine? Or would you recommend doing the work-a-round where I first reformat and partition, then install vista without a serial, then upgrade with the serial after? Is there really any difference? Would I gain any performance or space on my hd? Currently vista takes up about 10 GB or so but I think that's normal?

Thanks for your opinions/suggestions.