i have xp home 32 bit as my OS now and i have another hard drive installed and ready to install win 7 64 bit on to. can i do this with xp running or should i disconnect the HD with xp on it, then when i start the computer it won't see any OS and then i could boot from the win7 dvd and do a clean installl and then re=connect the HD with xp on it. then when i start computer i should get the choice of which one to boot from or is this not the way to do it?? i want the OS's on separate HD's for now as i am sure that not everything that i want to run will work on the 64 bit win7 until i can afford to get all the programs i use to work on win7.