ABOUT : Win XP & Win 7

	Windows 7	Windows XP
License	Proprietary commercial software	Proprietary commercial software
Worldwide release	October 22, 2009	October 25, 2001
Stable release	February 22, 2011	April 21, 2008
Kernel type	Hybrid	Hybrid
Platform support	IA-32 and x86-64	IA-32, x86-64 and Itanium
Preceded by	Windows Vista	Windows 2000 Windows ME
Succeeded by	Windows 8	Windows Vista
Physical Memory Limits	2 – 192 GB depending on the version and architecture.	4 GB-128 GB depending on the version and the architecture.
Processors	32 for 32-bit, 256 for 64-bit	32 for 32-bit, 64 for 64-bit
New Features	Touch and handwriting recognition Support for virtual hard disks Improved performance on multi-core processors Improved boot performance DirectAccess Kernel improvements Taskbar New version of Windows Media Center XPS Essential Pack New calculator Jump Lists Show desktop button shifted to right-hand size 13 Additional Sound Schemes Window borders and the taskbar do not turn opaque when a window is maximized Allows more customization A new version of Microsoft Virtual PC, newly renamed as Windows Virtual PC Supports the mounting of a virtual hard disk (VHD) as normal data storage. The Remote Desktop Protocol supports real-time multimedia application. Shadow Copy Improved backup and restore New Extended Linguistic Services API Better support for solid-state drives, including the new TRIM command New networking API with support for building SOAP-based web services in native code.	GDI+ graphics subsystem DirectX 8.1 upgradeable to DirectX 9.0c Improved Taskbar New features (task panes, tiles, improved sorting and grouping, built-in CD player, Autoplay, Simple File Sharing, etc.) Kernel enhancements Faster start-up Ability to discard a newer device driver in favor of previous one. More user-friendly interface Fast user switching ClearType Font rendering mechanism. New networking features (Windows Firewall, Internet Connection Sharing integration with UPnP, NAT traversal APIs, Quality of Service features, IPv6 and Teredo tunneling, etc.) Remote Assistance and Remote Desktop features. New security features Side-by-side assemblies Improved media features Handwriting recognition, speech recognition and digital ink support. Improved application compatibility and shims compared to Windows 2000 Updated accessories and games
Removed Features	Classic Start Menu user interface Few Taskbar features Windows Explorer features Windows Media Player features InkBall Windows Photo Gallery, Windows Movie Maker, Windows Calendar and Windows Mail.	CD Player, DVD Player and Imaging for Windows NetBEUI and NetDDE are deprecated. DLC and AppleTalk network protocols are removed. Plug-and-play–incompatible communication devices are not supported. Service Pack 2 and Service Pack 3 also remove features from Windows XP.