From one of my very talented sysadmins, good advice for everyone:
There are some critical updates available for Windows users. When you have a free moment, click Start, Programs, Windows Update. Downloading all updates and rebooting will take between 10 to 15 minutes. A system administrator/goon will pay a visit upstairs later today to ensure you've upgraded. Whatever you do, do not poke or feed the system administrator–especially after midnight.
Windows, the gift that keeps on giving.