http://www.petri.co.il/how-to-disable-smb-2-on-windows-vista-or-server-2008.htm
Warning!
This document contains instructions for editing the registry. If you make any error while editing the registry, you can potentially cause Windows to fail or be unable to boot, requiring you to reinstall Windows. Edit the registry at your own risk. Always back up the registry before making any changes. If you do not feel comfortable editing the registry, do not attempt these instructions. Instead, seek the help of a trained computer specialist.
Run "regedit" on Windows Server 2008 based computer.
Expand and locate the sub tree as follows.
HKLM\System\CurrentControlSet\Services\LanmanServer\Parameters
Add a new REG_DWORD key with the name of "Smb2" (without quotation mark)
Value name: Smb2
Value type: REG_DWORD
0 = disabled
1 = enabled
Set the value to 0 to disable SMB 2.0, or set it to 1 to re-enable SMB 2.0.
Reboot the server.