Microsoft has released an ISO images with all April 2007 Security updates

This DVD5 ISO image file contains the security updates for Windows released on Windows Update on April 10th, 2007. The image does not contain security updates for other Microsoft products. This DVD5 ISO image is intended for corporate administrators who manage large multinational organizations, who need to download multiple individual language versions of each security update and who do not use an automated solution such as WSUS. Use this image to download multiple updates in all languages at the same time.

Caution: Be sure to check the individual security bulletins at http://www.microsoft.com/technet/security prior to deployment of these updates to ensure that the files have not been updated at a later date.

April 2007 Security Releases ISO Image