http://support.microsoft.com/kb/187498/en-us

 To disable the SSL 2.0 protocol so that IIS does not try to negotiate using the  SSL 2.0 protocol, follow these steps:

1. Click Start, click Run, type regedt32 or type regedit, and then click OK.
2. In Registry Editor, locate the following registry key:
   
   
   HKey_Local_Machine\System\CurrentControlSet\Control\SecurityProviders \SCHANNEL\Protocols\ SSL 2.0\Server
3. On the Edit menu, click Add Value.
4. In the Data Type list, click DWORD.
5. In the Value Name box, type Enabled, and then click OK.
   
   Note If this value is present, double-click the value to edit its current value.
6. Type 00000000 in Binary Editor to set the value of the new key equal to "0".
7. Click OK. Restart the computer.