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HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers
Then you simply create a DWORD "Enabled" and add a Hex 0 in the field. This is necessary for all the ciphers with less that 128-bit encryption.
I currently have "Enabled = 0" in these keys:
DES 56/56
NULL
RC2 40/128
RC4 40/128
RC4 56/128
and I have "Enabled = 0" in Protocols:
PCT 1.0 - Server and Client
SSL 2.0 - Server and Client
I did not edit Ciphers:
RC2 128/128
RC4 128/128
Triple DES 168/168
and Protocols:
SSL 3.0
TLS 1.0