How to remove default share in Windows Vista and Windows 7

Click Start, type regedit in the Search box, and then click regedit.exe in the search results. The User Account Control dialog box appears.

Enter your UAC credentials to continue. Windows Vista opens the Registry Editor.

Open the HKEY_LOCAL_MACHINE branch.

Open the SYSTEM branch.

Open the CurrentControlSet branch.

Open the Services branch.

Open the LanmanServer branch.

Select the Parameters branch.

Select Edit, New, DWORD (32-bit) Value. Vista adds a new value to the Parameters key.

Type AutoShareWks and press Enter. (You can leave this setting with its default value of 0.)

Restart Windows Vista / 7 to put the new setting into effect.