Hotfix and Security Bulletin Service at http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/current.asp .
View the security bulletins that are available for your system.
Microsoft Service Packs at &.
.NET Framework Service Packs:
Article 318836, "INFO: How to Obtain the Latest .NET Framework Service Pack" in the Microsoft Knowledge Base at http://support.microsoft.com/default.aspx?scid=kb;en-us;318836 .
Article 318785, "INFO: Determining Whether Service Packs Are Installed on .NET Framework" in the Microsoft Knowledge Base at http://support.microsoft.com/default.aspx?scid=kb;en-us;318785 .