Microsoft released a new version of Advapi32 for Windows XP SP3 with version number 5.1.2600.5755. Here is the corresponding patch.
Windows 7 RC has just arrived, so is the patch for CSP development and testing.
Microsoft released a new version of Advapi32 for Windows Server 2003 with version number 5.2.3790.4455. Here is the corresponding patch.
Here is the patch for Vista SP2 version of advapi32. You'll also find a short description of important patching steps.
The latest patch for Windows 7, both 32-bit and 64-bit.
The latest patch for 64-bit Vista SP2 and Windows 2008 SP2 (advapi32 version 6.0.6002.18005).
The latest patch for 64-bit Windows XP SP2 (advapi32 version 5.2.3790.4455).