Windows 7: Skipped Reformat?

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?

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What do you think is wrong with NTFS. That is the standard Windows7 format. Was Windows 7 installed?

I don't think anything is wrong with NTFS. I just don't understand why it never gave me the option to reformat the hard drive. I found the answer in another new thread anyways. Apparently, once you delete all of your hard drive, Windows 7 will automatically reformat the unpartitioned space even if you don't tell it to and just click continue as I did.

Correct.

yes windows has to format the drive to install , so if you deleted it it would have been formatted