Normally, I do not post anything about Windows updates for tips, but today is an exception. Last night Microsoft released a patch for all versions of Windows. While the details of what this patch addresses are not released, the description states:

The vulnerability could allow remote code execution if an affected system received a specially crafted RPC request. On Microsoft Windows 2000, Windows XP, and Windows Server 2003 systems, an attacker could exploit this vulnerability without authentication to run arbitrary code. It is possible that this vulnerability could be used in the crafting of a wormable exploit.

This must be a pretty big deal because typically Microsoft waits until the 2nd Tuesday of every month to release operating system patches, so the fact they pushed this out early indicates it must be important.

It is recommended you install this patch and reboot your computer as soon as you can to ensure your system remains protected.