Open a Command Prompt With Administrator Rights And Enter The Following Sequence Of Commands:
- diskpart
- list disk
- select disk {number}
- clean
- create partition primary
- select partition 1
- active
- format fs=fat32 quick
- assign
- exit
In the "select disk" command, replace {number} with the drive number of your USB drive. Take care to choose the correct number since this procedure erases everything on the drive you select.