I think you could go into device manager and delete all signs of the driver. I haven't had this issue, though so I can't really help with it. What I can say is that if it does click, place the hard drive into a freezer for 1 month MINIMUM and then take it out and let it sit for a 3 to 7 days. It worked for me.
Actually, here...
Open up device manager as admin.
Open up the disk drives category.
Disable your external then uninstall. Restart then if your hard drive came with any installation CD, put that in the tray. Also, do NOT use PC powered USB hubs. If it doesn't come with a CD, just plug it in. It should being to install drivers.