Yes they are, there is the option on start up as to which one I want to go into. The fresh OS install is on 'G' what I am on now. I want to completely wipe 'C' as it is riddled with Virus and Spyware and use it for storage.
You could use Fixdisk (a dos command) how we did it years ago but it is too difficult for me to try and explain and things can go wrong very easily. Would suggest a friend with expert knowledge if disk manager will still not co operate