Microsoft has released an update for Windows 8 and Windows Server 2012 to address an issue with the Explorer.exe process

Assume that you use one of the following input methods on a Windows 8-based or Windows Server 2012-based computer that has update 2770917 installed:

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While the desktop is open, you tap or click the Settings charm, and then you tap or click the desktop. In this situation, the Explorer.exe process may crash.

For more information about update 2770917, click the following article number to view the article in the Microsoft Knowledge Base:
2770917 Windows 8 and Windows Server 2012 cumulative update: November 2012

Download for Windows 8 (32-bit)
Download for Windows 8 (64-bit)
Download for Windows Server 2012