1. plug in drive
2. go to control panel
3. Select admin tools
4. Select computer management
5. Select Storage
6. Select Disk management
The window will display all disks including flash drives. Right click on each partition selecting delete partition. Delete any and all partitions on the flash drive
7. uninstall the drive
8. Unplug the drive
9. Restart computer
10. After windows had completely loaded plug the drive back in and windows should prompt you to format it. Do it. In the capacity scroll menu check to see that the drive is back tot its appropriate size.