thanks again but what is the required space for windows 7 ultimata, professional, and home premium
Including the Paging File and space for the Hibernation (sleep mode), it will take about 12 GB roughly. If you move the Paging File to another hard drive it will save about 3-4GB of space. If you disable Hibernation, you'll save another 2-4 GB depending on the amount of RAM you have.
I always move my Paging File to a separate hard drive, as Windows works better, less fragmentation too.
I use a dedicated 64GB partition to install Windows 7 and all programs to, some here will say that's too big. Maybe, but I've never had any issues doing it that way and several of my friends who are MSDN members and TechNet members say that is just about ideal.
Since the size of hard drives are 360GB and bigger, it doesn't really matter that the partition is 64GB in size. Right now my C drive is that size and all the software installed plus Windows 7 is taking up about 24GB of space, so I could get by with a 32 or 40GB partition size and be just fine.