This year is the 10th anniversary of "Patch Tuesday". Microsoft releases patches on a scheduled basis to help IT staff and users keep their software up to date. This last scheduled patch set for 2013 is a great opportunity to give yourself and those around you the gift updated software! Microsoft will release their patches this Tuesday the 10th. Make sure that your machines are patched and updated. Sophos Naked Security Blog has a nice post on this months updates: http://nakedsecurity.sophos.com/2013/12/08/microsoft-patch-tuesday-get-ready-to-patch-and-reboot-the-lot-including-server-core/
Quoting from Sophos:
By the way, this month really is an omnibus (a Latin word meaning "for everyone") update. All platforms are affected, from XP to 8.1 and from Server 2003 to 2012, including installs of the stripped-down Server Core variants. In addition, this month's Internet Explorer update covers the whole product range, from IE 6 to IE 11.
In short: plan to patch (and to reboot) every Windows-based computer and virtual machine in your business, no later than at the earliest opportunity.