note: before doing any of this, backup the data on your drive (if u haven't already)
right click computer, go to manage, then click disk management (wait, it could take a minute to detect all your drives)
find your drive, from here u can format it, partition it etc. (windows has limitations though, but since ur drive is 8GB u should still be able to format it as fat32 from here).
Check and see if the drive has multiple partitions, if it does, delete them all (right click --> delete), then right click the unallocated space and format it as fat32
try the drive again w/ ur usb loader, if it doesn't work, go back to disk management, right click the partition, and look around for something to set the partition as active... I don't remember what exactly but it should be intuitive (I'm at work right now w/out admin rights, so I can't check and tell u)