Its good that Microsoft releases security updates for their Internet Explorer browser a including for Windows Via automatic updates which protects users from vulnerabilities that exists and allows an attacker to inject malicious code into user’ system via specially crafted page .From security point of view it’s always better to operate your system with standard user account instead of with admin rights, the December 2011 cumulative security update for Internet Explorer i.e Internet Explorer 9.0.4 update now available via Windows update.

Those users who turned on automatic updates should get IE 9.0.4 update along with other updates, if you haven’t enabled automatic updates for windows go ahead and enable it, click on Start menu, type “Windows Update” in the search box and click on it to launch and let the windows download and display available updates where you can select IE9.0.4 and install in your Computer.

“This security update resolves three privately reported vulnerabilities in Internet Explorer. The most severe vulnerability could allow remote code execution if a user opens a legitimate HyperText Markup Language (HTML) file that is located in the same directory as a specially crafted dynamic link library (DLL) file.”

“This security update is rated Important for Internet Explorer 7, Internet Explorer 8, and Internet Explorer 9 on Windows clients and for Internet Explorer 9 for Windows Server 2008 R2. This security update is also rated Moderate for Internet Explorer 6 on all supported editions of Windows XP. This security update is also rated Low for Internet Explorer on Windows servers (except Windows Server 2008 R2). For more information, see the subsection, Affected and Non-Affected Software, in this section.”