Out of band patch being released on 3 April 2007 to address the Windows Animated Cursor Handling security exploit
On Tuesday 3 April 2007 Microsoft is planning to release one Microsoft Security Bulletin affecting Microsoft Windows. The highest Maximum Severity rating for these is Critical. These updates will require a restart. These updates will be detectable using the Microsoft Baseline Security Analyzer."
MSRC have blogged about the release:
I strongly recommend that everybody install this patch as soon as it is released.