Windows 7: cannot delete mapped drive

i used this command to try to map a shared drive to Sharepoint, from another pc, wmic /node:172.20.32.173 /user:jonathan process call create "net use z: \\sharepoint@SSL\DAVWWWRoot\sites\stuff\" it mapped a z: drive, juts not to sharepoint, but to somewhere deep in the jonathan profile ... i ran this command on that machine, net use x: \\sharepoint@SSL\DAVWWWRoot\sites\stuff\" and got the appropriate x: drive, pointing to the right sharepoint location. so now i have a z: drive that will not die.ding /delete to st command does not work. in my computer it shows up as a local drive, but it is not listed in disk manager, mountvol , or diskpart. right clicking on it does not give the disconnect option. i have logged out, and in with another account, and rebooted, still there.