Microsoft has made the Windows Vista and 2008 Service Pack 2 available for download (32 bit and 64 bit). It is always recommended to download directly from the Microsoft’s official website to avoid any modified or an infected copies of software.
If you do not download those update now they will be automatically applied later in the next few weeks.
From our side applying new update and patching our operating system (OS) which contains millions of code lines is a way to protect against viruses, worms and Trojans.
So make sure that your computers are safe and Keep working!