Microsoft made available a hotfix for the issues that arises when the Windows OS stops responding for no apparent reason: "A computer running Windows Server 2008 R2 or Windows 7 stops responding randomly. Applications or services that are running on the computer stop working correctly. Additionally, you cannot log on to the computer by using the remote desktop connection utility." This issue occurs because of a deadlock condition between the Lsass.exe process, the Redirected Drive Buffering Subsystem (Rdbss.sys) driver, and the Winsock kernel," explains Microsoft in KB2265716.
A hotfix is available for download, and is designed to allow end users to resolve the problem described above. But, Microsoft emphasizes that only customers affected by this specific issue apply the hotfix.