I bought a Kingston USB drive, and after unsuccessful install by Windows (7) I went to Kingston's support webpage and followed the instructions of how to make it work. I assumed the problem was the drive's letter (the letter 'E' was taken by a different USB drive) so I tried to change it to 'F.' I don't even know if it makes sense, but I ended up with another drive.
I tried to delete it from the disk management, but no success. Is my only option now is to format Windows? Is there another solution?