See if your Windows XP-based PC can run Windows Vista. Download the Windows Vista Upgrade Advisor.

The Ultra-Mobile PC is portable, lightweight, and able to connect on the go. It’s the device you’ll always want with you.

Find out how to troubleshoot common (and not-so-common) problems using Windows XP.

Follow these quick guidelines to maintain your computer and keep it running smoothly.

Windows Vista Home Premium is for the family that wants the most from digital entertainment, stay connected to family and friends, and track household expenses—all with the peace of mind that comes from being more secure online.

Download Windows Defender for Windows XP for free and help protect your computer against spyware.

Download the latest release of Windows Media Player and experience MTV's URGE music service.

Upgrade your browser with confidence. Get tabbed browsing, better printing, easier searches, and improved security. Download Internet Explorer 7 today.

From security to digital photography, from games to networking, learn how to use the features and technology that come with Windows XP.

Find troubleshooting tips, guided help, and downloads for Windows XP.

Designed to meet the needs of large organizations with complex IT infrastructures. Windows Vista Enterprise can help you lower IT costs while providing added protection for sensitive data.

Get advice, products, tools, and information tailored to your business in the Microsoft Small Business Center.

Download Windows Vista Hardware Assessment 2.0 today and find out if your existing computers are ready for Windows Vista.

Get how-to articles, troubleshooting advice, and other resources for IT professionals.

There’s no better place for IT pros than TechNet for Windows Vista resources.

Get the instructions you need for deploying or migrating to Windows Vista. These guides also describe how to configure security, monitor performance, and manage printers.

Get guidance for how to optimally deploy Windows Vista and the 2007 Office system.

Find technical articles, code samples, and more for Windows XP.

Get the information you need to develop applications for Windows Vista at this MSDN Developer Center.

Get started developing solutions that fully optimize the powerful new features and enhancements of Windows Vista.