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Then you should be using h: not f:
Two points:1. If you already have files on the drive (i.e. you copied windows setup files before you realized you need to make it bootable) skip steps 5&6. It won't hurt.2. Forget what Microsoft says, the odds of being able to boot of an NTFS formatted USB stick are near zero. Always/Only use FAT32 for bootable USB. In other words, Step 9 should read 'format fs=fat32 quick'
None of that matters. Once the drive is bootable, you just copy the x64 installation files to it and reboot. You'll probably have to tell the computer to boot from the USB stick when it comes back on. (method varies, usually mashing a key)If you're getting any kind of message about compatibility with the version of windows you're running, it's because you're still in windows. You should not be. The whole point of this process is that your computer will load from the USB stick instead of going into windows. If you wish to go from 32 bit windows to 64 bit, you'll need to boot from that USB stick and do a clean install - wipe it and start over. There's no way to upgrade or convert 32 to 64, only replace.