Windows 7 RTM Support Ending April 9, 2013
Are you still using Windows 7 on your PC, and aren’t tempted the least bit by all the new features in Windows 8? In a Windows blog post, Microsoft is reminding users of Windows 7 RTM (with no service pack installed) that support is ending on April 9, 2013, which is less than two months away. This comes roughly 24 months after the release of Windows 7 Service Pack 1 (SP1), and is consistent with Microsoft’s usual support practice for Windows.
Of course, this doesn’t mean that mainstream support (for new features, security updates, bug fixes, complimentary phone and online support options) for Windows 7 is ending; this will continue till January 13, 2015, as long as you’ve the supported service pack. And extended support will continue till January 14, 2020.
To continue to be in the support lifecycle and to keep up to date with previously released security, performance, and stability updates, if you’re still using the initial release of Windows 7 (be it a Home Premium, Professional, Ultimate, or Enterprise edition), you’re recommended to download and install SP1.
Source: Windows Blog