Los parches los tenes que descargar directamente de Microsoft segun el windows que tengas.
Estos son los que previenen gusanos como el Korgo pero antes tenes que tener los SP, entra en microsoft update y de ahi los podes sacar todos.
Microsoft Windows NT Workstation 4.0 Service Pack 6a
http://www.microsoft.com/downloads/d...aspx?FamilyId=
7F1713FC-F95C-43E5-B825-3CF72C1A0A3E&displaylang=es
Microsoft Windows NT Server 4.0 Service Pack 6a
http://www.microsoft.com/downloads/d...aspx?FamilyId=
67A6F461-D2FC-4AA0-957E-3B8DC44F9D79&displaylang=es
Microsoft Windows NT Server 4.0 Terminal Server Edition SP6
http://www.microsoft.com/downloads/d...aspx?FamilyId=
Ç62CBA527-A827-4777-8641-28092D3AAE4F&displaylang=es
Microsoft Windows 2000 SP2, SP3 y SP4
http://www.microsoft.com/downloads/d...aspx?FamilyId=
0692C27E-F63A-414C-B3EB-D2342FBB6C00&displaylang=es
Microsoft Windows XP and Microsoft Windows XP Service Pack 1
http://www.microsoft.com/downloads/d...aspx?FamilyId=
3549EA9E-DA3F-43B9-A4F1-AF243B6168F3&displaylang=es
Microsoft Windows XP 64-Bit Edition Service Pack 1
http://www.microsoft.com/downloads/d...aspx?FamilyId=
C6B55EF2-D9FE-4DBE-AB7D-73A20C82FF73&displaylang=en
Microsoft Windows XP 64-Bit Edition Version 2003
http://www.microsoft.com/downloads/d...aspx?FamilyId=
C207D372-E883-44A6-A107-6CD2D29FC6F5&displaylang=en
Microsoft Windows Server 2003
http://www.microsoft.com/downloads/d...aspx?FamilyId=
EAB176D0-01CF-453E-AE7E-7495864E8D8C&displaylang=es
Microsoft Windows Server 2003 64-Bit Edition
http://www.microsoft.com/downloads/d...aspx?FamilyId=
C207D372-E883-44A6-A107-6CD2D29FC6F5&displaylang=en