The out-of band hotfix has created problems in combination with the RealTek Soundchip and some other applications. While the impact of these issues is clearly not widespread, it is affecting some of our customers. To help customers who have these applications installed, we will be releasing the hotfix that resolves this issue hotfix to affected customers through Windows Update (WU), Microsoft Update (MU), and Automatic Updates (AU) as part of the Tuesday April 10, 2007 release as a High Priority non-security update.
Source:→ MS Security blog
Microsoft, Hotfix4Hotfix, Update, Windows Update, Microsoft Update, Automatic Updates