What Do These Safety Updates Do?
These patches from Microsoft replace several particular person information involved in making Windows and different Microsoft software program work.Do I Need These Security Updates?
You need these updates if you're running any currently supported, 32-bit or 64-bit, Windows operating system: Windows 8, Windows 7, Windows Vista, or Windows XP, plus Windows server versions and Windows RT.
Security updates are also being pushed for Microsoft Office InfoPath, Office Web Apps, SharePont Server, Groove Server, and SharePoint Foundation.
Some of this month's updates fix problems so serious that if left unpatched, it's possible that someone could gain access to your computer in very specific situations. These issues are given a Critical severity rating.
Most of the fixes this month aren't quite as serious but are security issues that should be corrected nonetheless. Some of these were given a severity rating of Important while others were categorized as Low.
Are There Any Non-Security Updates This Month?
Yes, including several non-security fixes for Windows 8, Windows RT, Windows 7, and current Windows Server versions. Firmware updates are also going out for Microsoft's Surface RT and Surface Pro tablets.
Also, as usual, Microsoft is pushing this month's update to the Windows Malicious Software Removal Tool.
There may also be non-security updates included this month for Microsoft software other than Windows. See the Non-Security Updates link below for details.
Patch Tuesday Problems
UPDATE: April's MS13-036 update (Described in KB2823324 as an update to the ntfs.sys file) is causing widespread problems for some people, possibly primarily those with Brazilian localized versions of Windows 7. See Microsoft's You receive an Event ID 55 or a 0xc000021a Stop error in Windows 7 after you install security update 2823324 support article for help. There will likely be more information to come, as well as a corrected update.
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This blog post has become Grand Central Station for Patch Tuesday problems each month. While updates from Microsoft rarely result in widespread problems with Windows itself, they do frequently cause specific issues with software or drivers provided by other companies.
Please see How To Prevent Windows Updates From Crashing Your PC for a number of preventative measures you should take before applying these updates, including disabling fully automatic updates.
If your computer freezes during the installation of an update, see How To Recover From a Frozen Windows Update Installation for help.
If the updates installed but you're now experiencing a problem, see How To Fix Problems Caused by Windows Updates for advice on how to undo the damage.
See Windows Updates & Patch Tuesday FAQ for answers to other common questions, including "Does Microsoft test these updates before they push them out?" and "Why hasn't Microsoft fixed the problem that their update caused on my computer?!"
Automatically install: via Windows Update.
Manually install: via the individual Security Bulletins listed here. See Do I Have 32-bit or 64-bit Windows? if you're not sure which downloads to choose.
Details from Microsoft: Microsoft Security Bulletin Summary for April 2013.
Non-Security Updates: New Non-Security Content for 2013.
Microsoft Surface: update history for the Surface RT and the Surface Pro.
Next Patch Tuesday: will be May 14, 2013.
A Note on the Comments Below:
I update this blog post for each Patch Tuesday by Microsoft so some of the comments left may be for previous Patch Tuesdays. You can tell which Patch Tuesday a comment is referring to by looking at the notation at the end of the comment. For example, comments addressing Patch Tuesday April 2013 will end with [PT: April 2013].
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