External hard drive not getting identified

Well im going to tell you a story bout how my life got flipped turned upside down, my computer was just chillin relaxing all good and my hard drive failed and I could run it at all so i put my ubuntu disc in and ran it off my external hard drive so i could get all my files out alive.

Now my computer is done and i plugged my external hard drive in and now it does not show up at all, I've went into disc management and have checked that it still exists, but i now need to use it on my windows XP and I do not really know how to get it back to its old state.

Thankyou in advance for any help given