A "critical" Windows patch can cause trouble on computers that run certain Hewlett-Packard photo-sharing software or the Kerio firewall...The problems occur because HP's "share-to-Web" software and the Kerio firewall interfere with a new file, verclsid.exe, delivered by the security update...

Windows users running the Google Toolbar are also reporting an access violation error when a window containing an inactive ActiveX control is closed.

• Unable to access special folders like "My Documents" or "My Pictures".
• Microsoft Office applications may stop responding when you attempt to save or open Office files in the "My Documents" folder.
• Office files in the "My Documents" folder are not able to open in Microsoft Office.
• Opening a file through an application's File / Open menu causes the program to stop responding .
• Typing an address into Internet Explorer’s address bar has no effect.
• Right-clicking on a file and selecting Send To has no effect.
• Clicking on the plus (+) sign beside a folder in Windows Explorer has no effect.
• Some third-party applications stop responding when opening or saving data in the “My Documents” folder.

...If the registry becomes corrupted or is improperly edited, the affected PC may not boot into Windows.

MS also made changes to how ActiveX behaves, has anyone had any problems with this? Especially at major sites such as your bank's.

Microsoft has completed its initial investigation into issues involving old third party software that customers may have experienced after the installation of this security update. On Tuesday, April 25, Microsoft will issue a targeted re-release of the MS06-015 update.

For customers who have already applied the update and are experiencing the problem related to the older Hewlett Packard Share-to-Web software, or older NVIDIA drivers prior to or including version 61.94, the revised update will be available through Windows Update and Microsoft Update. The targeted re-release will be automatically delivered to affected computers through Automatic Update if it has been enabled The re-release will not be distributed to non-affected computers.