Windows Client links that were posted on Microsoft.com from 1/13/09 – 1/16/09 that might be of interest:
KB958687 (A security issue has been identified that could allow an unauthenticated remote attacker to compromise your system and gain control over it.):
WinXP (x86) - https://www.microsoft.com/downloads/details.aspx?familyid=EEAFCDC5-DF39-4B29-B6F1-7D32B64761E1&displaylang=en
WinXP (x64) - https://www.microsoft.com/downloads/details.aspx?familyid=26898401-F669-4542-AD93-199ED1FE9A2A&displaylang=en
Vista (x86) - https://www.microsoft.com/downloads/details.aspx?familyid=9179C463-C10A-452A-990F-B7E37CDD889B&displaylang=en
Vista (x64) - https://www.microsoft.com/downloads/details.aspx?familyid=6B26952E-B59D-4B0F-A52D-025E45ECD233&displaylang=en
January 2009 Security Release ISO Image: https://www.microsoft.com/downloads/details.aspx?familyid=1b93a273-906f-4049-b6f1-f4caf2117564&displaylang=en&tm
Windows 7 and Windows Server 2008 R2 DirectAccess Executive Overview: https://www.microsoft.com/downloads/details.aspx?familyid=d8eb248b-8bf7-4798-a1d1-04d37f2e013c&displaylang=en&tm
Technical Overview of DirectAccess in Windows 7 and Windows Server 2008 R2: https://www.microsoft.com/downloads/details.aspx?familyid=64966e88-1377-4d1a-be86-ab77014495f4&displaylang=en&tm
BranchCache Executive Overview: https://www.microsoft.com/downloads/details.aspx?familyid=a69eea64-0fb2-4496-966f-2df64c56d315&displaylang=en&tm
Windows 7 and Windows Server 2008 R2 Networking Enhancements for Enterprises: https://www.microsoft.com/downloads/details.aspx?familyid=38fd1d96-3c6e-43ca-b083-3334ddd1ef86&displaylang=en&tm
Windows 7 and Windows Server 2008 R2 Networking Enhancements Executive Overview: https://www.microsoft.com/downloads/details.aspx?familyid=804f4909-3bbf-40a2-80fa-7fa369713b79&displaylang=en&tm