The following are steps to turn off default local drive shares across networks. I've only tried it on Windows XP.
- Type 'regedit.exe' in "command prompt" or "run"
- Navigate to:
HKey_Local_Machine\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters\AutoShareWks
- If it doesn't exist, create one using DWORD key
- Set it to 0 (zero) to disable C$, D$ or other local drive shares over the networks
- Set it to 1 (one) to enable C$, D$ or other local drive shares over the networks
- Restart your Windows XP
- To confirm, in "command prompt", type 'net share'
- You shouldn't see C$, D$ or other local drives
- Done!