Windows 7 - Cannot access re-shared external hard drive

Hi, I have a Maxtor External Hard drive and Windows 7 Premium 64 bit. I have a user setup for each member of my family on the computer. The maxtor drive was working fine uptil I decided that I wanted only myself to be able to access it only. The drive appeared as my K drive. I went to sharing and added myself as read/write access and removed the everyone share thinking that only I would be able to use the drive. I restarted my PC and now nobody can access it. When I plug the drive into the usb slot the drive whirs up as normal but there is no drive letter for it and it does not appear in device manager etc. I plugged it into my old XP machine and that cannot read it either.

Please Help.

Daniel.

Add Everyone back, can you access it then?

When I said in my first statement that nobody can access it, I also meant me as well. When I log in I cannot see the drive either. No drive letter is assigned for it.