Yesterday, I installed Windows 7 64 bit to replace my Windows XP. I booted off the DVD, and I vaguely remember having to select a type of install. I honestly don't remember which one I chose. I think it was custom or clean install (something like that), because I figured the upgrade option wouldn't work since XP is 32 bit. Anyway, I got to a point where it shows the partitions on the hard drive. I chose to delete everything on my hard drive. Now this is where the confusion sets in. There was a "New" button which I believe was for a new partition, but I wasn't interested in creating multiple partitions. There was also some kind of "Format" button, but it was grey and could not be clicked. I didn't know what to do so I clicked continue and windows installed. I checked my C: drive in My Computer and it says NTFS format. What the hell happened here? Do I need to start over?