Microsoft has announced that it will end support for the RTM version of Windows 7 on April 9, 2013, two years after the release of the first service pack for the OS



From Neowin:

If you happen to be one of those Windows 7 users, you might want to consider downloading and installing SP1 as soon as possible. Microsoft updated the official Windows blog with word that official support for Windows 7 RTM will end in just a couple months. The support will stop on April 9, 2013, about 24 months after the launch of the Windows 7 service pack.

If you have a PC with Windows 7 SP1 installed, don't worry; official mainstream support for Windows 7 won't end until January 13, 2015. Extended support for the OS (meaning security patches but no new features) won't end until January 14, 2020. In any case, it is in your best interest to download and install that service pack, if only to keep your system up to date with the most recent version of the OS.

  Windows 7 RTM support ends April 9, 2013