Make sure your Windows XP-based PC is ready to run Windows Vista. Download and run the Windows Vista Upgrade Advisor.

Windows Vista Service Pack 1 (SP1) is the complete set of Windows Vista updates Microsoft has issued over the past year plus additional enhancements to improve your PC experience. SP1 doesn't add new features or require you to learn anything new —it simply makes your PC more reliable, run more smoothly, and even more enjoyable to use. Find out more and download it now.

Choose the edition designed for the way you use your PC, from home entertainment to small business productivity.

Protect, maintain, and manage your PCs with Windows Live OneCare, the always-on PC care service from Microsoft. Working quietly in the background, OneCare helps protect your PC against viruses, spyware, hackers, and other unwanted intruders. Each one-year subscription covers up to three PCs, providing anti-virus and anti-spyware protection, multi-PC management, printer sharing, centralized data backup, and more. Try it FREE* for 90 days or see the demo.

* Access to and use of the Internet may require payment of a separate fee to an Internet service provider. Local and/or long-distance telephone charges may apply.

Claim your space and make it your own. Pick backgrounds, upload photos, and share your thoughts.

Upgrade with confidence. Get tabbed browsing, better printing, easier searches, and improved security.

Get updates, tips, how-tos, and creative ideas for Windows right in your inbox with the Exploring Windows newsletter.

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

Get the best of the business, mobility, and home entertainment features that Windows Vista has to offer, all rolled into one with Windows Vista Ultimate.

Choose the edition designed for the way you use your PC. From home entertainment to small business productivity, there's an edition of Windows Vista that's right for you.

See how Windows SteadyState can help keep shared PCs in schools, Internet cafés, and libraries running smoothly.

Find the answers to common questions related to using Windows at home or at work.

Connect with Windows users like you, get tips from the experts, and hear directly from teams at Microsoft. Check out the blogs, chat rooms, webcasts, and articles in our Community websites.

Discover new ways to grow your knowledge of how to use Windows with online chats, online training, and live events.

See how Windows SteadyState can help keep shared PCs in schools, Internet cafés, and libraries running smoothly.

Try the first edition of Windows designed specifically for small businesses-without having to install it on your PC.

Designed to meet the needs of large organizations with complex IT infrastructures. Find out more about how Windows Vista Enterprise can help you lower IT costs, increase the productivity of your people, and provide added protection for your company's data.

See how Windows Vista Business will help keep you focused on the growth and success of your business.

Visit the Microsoft Small Business Center to learn more about how Windows and Office can help keep your business on track.

Windows Desktop Search for Windows XP helps your people quickly find and retrieve e-mail, documents, and files on their PCs and across the network.

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

For Windows Vista knowledge, there's no better place for IT pros to start than TechNet.

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

Get more control, greater flexibility, and increased protection for your server infrastructure and be automatically registered to access valuable beta resources.

Download the deployment, compatibility, and activation tools you need to start your Windows Vista rollout.

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

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.

Internet Explorer 8 Beta 1 is a developer preview for web designers and developers to help prepare their websites for the launch of Internet Explorer 8. Some of the new features designed for developers include a developer toolbar and improved interoperability and compatibility.