Upgrading to windows 7 64 bit from xp 32bit

As i don't have a DVD burner on my PC, I've been trying to make an bootable USB stick but when i try run the command to make it so it can boot but i get an error saying that it cant run it. Though found this guide Icrontic » Install Windows 7 from USB, which says i should use a 32bit win7 iso 1st then change 2 a 64bit, but as i don't have a 32bit iso i cant do that.

So is there anyway of me installing win 7 64bit without a dvd?

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