|Well no, you can't just type the computer name like that.|
You'd have to use backslashes before the computername, like in guapo's example:
But even then, this would only let administrators see the D drive. D$ is an "administrative share". So share the drive, call the share name D, and
Also, make sure you have allowed file and print sharing in the Windows Firewall, or whatever firewall you are using.