System Requirements:
* Processor: 1 gigahertz (GHz) or faster
* RAM: 1 gigabyte (GB) (32-bit) or 2 GB (64-bit)
* Hard disk space: 16 GB (32-bit) or 20 GB (64-bit)
* Graphics card: MicrosoftDirectX 9 graphics device or higher

New Features:
* Swipe, slide, and zoom - Touch a full-powered PC. It's fast and it's fluid. Take natural, direct, hands-on control.
* Apps, front and center - Apps in Windows 8 work together to get things done faster. Get them from the Windows Store.
* Your Windows, everywhere - Windows 8 can connect you to your files, photos, people, and settings, wherever you sign in.
* Wall-to-wall web - Internet Explorer 10 Consumer Preview brings you immersive web browsing on screens big and small.
* The familiar, made better - Still devoted to your mouse and keyboard? Windows 8 makes the tried-and-true feel brand new.

* Download Windows 8
* Windows 8 FAQ

Official Microsoft themes, wallpapers and gadgets.

* Download Windows 7 Themes
* Download Windows 7 Wallpapers
* Download Windows 7Gadgets

By installing the Compatibility Pack along-side of Microsoft Office XP, or Office 2003, you will be able to open, edit, save, and create files using the formats that are used by Office 2010 and the 2007 Office system. Office 2000 users, as well as users of Windows 2000 SP4 and later, can convert Open XML Formats to binary file formats from within Windows Explorer.

* Download Microsoft Office Compatibility Pack

Windows Live Essentials 2011 includes:
1. Messenger (Windows, MSN)
2. Photo Gallery
3. Movie Maker
4. Windows Live Mesh (Keep photos and documents in sync between your computers, and on SkyDrive. Connect remotely to all of the files and programs on your PCs.)
5. Writer (Blog)
6. Family Safety (Parental control)
7. Mail (Hotmail, Live)
8. Messenger Companion (See and comment on links your friends have shared as you visit websites in Internet Explorer.)
9. Bing Bar (Search bar)
10. Outlook Connector Pack (Includes Microsoft Outlook Hotmail Connector and Outlook Social Connector Provider for Messenger.)
11. Microsoft Silverlight (Silverlight browser plug-in)

Requirement:
Windows 7 or Windows Vista with Service Pack 2.

* Download Windows Live Essentials 2011

Windows 7 Service Pack 1 adds support for Advanced Vector Extensions (AVX), a 256-bit instruction set extension for processors, and improves IKEv2 by adding additional identification fields such as E-mail ID to it. In addition, it adds support for Advanced Format 512e as well as additional Identity Federation Services. Windows 7 Service Pack 1 also resolves a bug related to HDMI audio and another related to printing XPS documents.

* Download Windows 7 Service Pack 1

Improvements in SP2:
1. Program compatibility.
2. Hardware support. SP2 provides you with additional support for Bluetooth wireless technology and improved performance for WiFi connections after the computer resumes from sleep mode. Additionally, you can now record data to Blu-ray Disc media.
3. General operating system updates. SP2 includes Windows Search 4.0, which has improved indexing and searching capabilities. SP2 also includes fixes that can improve recording TV using Windows Media Center.

* 32-bit Windows Vista Service Pack 2
* 64-bit Windows Vista Service Pack 2

A total of 1,174 fixes have been included in Windows XP Service Pack 3.

* Download Windows XP Service Pack 3