MS11-018: Cumulative security update for Internet Explorer: April 12, 2011

Microsoft has released security bulletin MS11-018. To view the complete security bulletin, visit one of the following Microsoft websites:

• Home users:
  http://www.microsoft.com/security/pc-security/bulletins/201104.aspx
  Skip the details: Download the updates for your home computer or laptop from the Microsoft Update Web site now:
  http://update.microsoft.com/microsoftupdate/
• IT professionals:
  http://www.microsoft.com/technet/security/bulletin/MS11-018.mspx

How to obtain help and support for this security update

Help installing updates: Support for Microsoft Update

Security solutions for IT professionals: TechNet Security Troubleshooting and Support

Help protect your computer that is running Windows from viruses and malware: Virus Solution and Security Center

Local support according to your country: International Support

Non-security-related fixes that are included in this security update

General distribution release (GDR) fixes

Individual updates may not be installed depending on the version of Windows and the version of the affected application. Please view the individual articles to determine your update status.

Hotfixes

Security update 2497640 packages for Windows XP and for Windows Server 2003 include Internet Explorer hotfix files and general distribution release (GDR) files. If no existing Internet Explorer files are from the hotfix environment, security update 2497640 installs the GDR files.

Hotfixes are intended to correct only the problems that are described in the Microsoft Knowledge Base articles that are associated with the hotfixes. Apply hotfixes only to systems that are experiencing these specific problems.

These hotfixes may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains these hotfixes. For more information about how to install the hotfixes that are included in security update 2497640, click the following article number to view the article in the Microsoft Knowledge Base:
Note In addition to installing hotfix files, review the Microsoft Knowledge Base article that is associated with the specific hotfix that you have to install to determine the registry modification that is required to enable that specific hotfix.

For more information about how to determine whether your existing Internet Explorer files are from the hotfix or from the GDR environment, click the following article number to view the article in the Microsoft Knowledge Base:

For a list of files that are provided within these packages, click the following link:

How to determine whether you are running a 32-bit or a 64-bit edition of Windows

If you are not sure which version of Windows that you are running or whether it is a 32-bit version or 64-bit version, open System Information (Msinfo32.exe), and review the value that is listed for System Type. To do this, follow these steps:

1. Click Start, and then click Run, or click Start Search.
2. Type msinfo32.exe and then press ENTER.
3. In System Information, review the value for System Type.
   • For 32-bit editions of Windows, the System Type value is x86-based PC.
   • For 64-bit editions of Windows, the System Type value is x64-based PC.

For more information about how to determine whether you are running a 32-bit or 64-bit edition of Windows, click the following article number to view the article in the Microsoft Knowledge Base: