Microsoft just released a large group of new security patch updates for the month of June, 2012. In this group, there are some critical security patches that need to be updated on Windows based machines as soon as possible.
Be certain to leave your workstations on but logged off when you leave office for the day in order to have your machine fully patched during off-business hours. Your computer will be rebooted during this task, so be sure to save any work.