Make sure the options “Enable Disk Format”, “Quick Format” and “Enable LBA (FAT16X)” are checked and the correct USB drive is selected in the dropdown list above. This formatting process will erase all data on your USB thumbdrive! Save all files you need before formatting it! Then click start, click OK and click YES in the window asking you whether you really want to erase all files. After a few seconds, the stick should be formatted. Now close the PeToUSB window and the remaining console window.
The thumbdrive is formatted in a way that supports booting now, but the boot record is still not correct. In order to fix that, you have to use the other tool you extracted, called bootsect.
Press Start, Run and enter “cmd” (without the quotation marks), then press enter.