1. Step Open up an elevated command prompt . If you are Windows 7 find the related tutorial here
2. Step Once you have an elevated command prompt you can start taking ownership of the USB drive by entering the following command: takeown /f H: /R /D y – where H: is your USB drive
If you want to know more about the parameters, read this takeown command line parameters
3. Step It is possible that you get the error Access is denied when running the command, then you should make sure to check your USB drive for errors and clear the read-only attributes