My issue is similar. I wasn't given an option to create partitions initially like every other version of windows. I started install, quit, and now I have a 100 mb partition that shows up as unallocated (possibly master boot drive) space. I suspect this could be the files from the setup I started, quit, and then began a new install. Is there an option to partition during install? Regardless, I'd like to swipe my HDD completely clean, format, and start again, but Win 7 is new to me and the help menus suck. I know this sounds pretty stupid, but I've rocked vista for a long time and 7 just seems too user friendly for me to find what I'm looking for.