Dani and Renato… this article is especially for you and any other member from Brazil, but applies to all using Windows.

"We are aware that some of our customers may be experiencing difficulties after applying security update 2823324, which we provided in security bulletin MS13-036 on Tuesday, April 9," Dustin Childs, group manager of Response Communications at Microsoft Trustworthy Computing, wrote on the Microsoft Security Response blog late last night.”

Apparently location (Brazil) and certain banking software can cause the problem:

“The affected bulletin fixed four elevation of privilege vulnerabilities in kernel mode drivers. Users in certain geographic areas, namely users in Brazil running the Brazilian version of Windows 7 (x86 and x64), who installed the update reported the blue screens, Paul Henry, security and forensic analyst at Lumension, told SecurityWatch. The bulletin can cause system errors on systems running "certain third-party software," Childs said. Qualys CTO Wolfgang Kandek identified the software as a banking security plugin called "G-Buster," which provides a virtualized environment for safer online banking. "G-Buster is interfering with the Windows kernel patch," Kandek said.

Just the same, MS is recommending you remove Security Update 2823324.

You can read more here:

http://securitywatch.pcmag.com/software-patches/310331-microsoft-yanks-faulty-update-from-april-patch-Tuesday

and here:

http://blogs.technet.com/b/msrc/archive/2013/04/11/kb2839011-released-to-address-security-bulletin-update-issue.aspx