MS05-001: Vulnerability in HTML Help could allow code execution

Microsoft has released security bulletin MS05-001. The security bulletin contains all the relevant information about the security update. This includes file manifest information and deployment options. To view the complete security bulletin, visit the following Microsoft Web sites:

• Home users:
  http://www.microsoft.com/protect/computer/updates/bulletins/default.mspx
• IT professionals:
  http://www.microsoft.com/technet/security/bulletin/ms05-001.mspx

Known issues

• Before you install security update 890175 (MS05-001), you must install critical update 811630 for some operating systems. For these operating systems, installing critical update 811630 after installing security update 890175 might cause reduced functionality in HTML Help if security update 890175 is later uninstalled.
  
  Note The reduced HTML Help functionality occurs only if security update 890175 is uninstalled.
  For additional information about this issue, click the following article number to view the article in the Microsoft Knowledge Base:
  892641 HTML Help files do not work correctly after you uninstall security update 890175 (MS05-001)
  
  
• Certain kinds of Web-based programs may not function correctly after you install security update 890175.
  For more information about this issue, click the following article number to view the article in the Microsoft Knowledge Base:
  892675 Certain Web sites and HTML Help features may not work after you install security update 896358 or security update 890175