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, all at no charge.
Updating your Windows Vista–based PC
The easiest way to update your Windows Vista-based PC with SP1 is by using the Windows Update control panel. Just set Windows Update to automatically download important updates and Windows Update will download SP1 when it's available for your PC. (It could take a month or more before SP1 shows up on your PC, so please be patient.) After SP1 is downloaded you'll see an alert like this:
Click on the alert to start the installation, which will take approximately one hour. (For the first half hour, you'll be able to use your PC. Then, you'll be asked to restart, and you won't be able to use your PC for the last half hour of the installation.)
You can also manually download and install Windows Vista SP1 from the Microsoft Download Center, but we strongly recommend using Windows Update. You should be an advanced computer user and have a broadband connection to consider using the Microsoft Download Center for SP1.
How to turn on automatic updates
Upgrading from Windows XP
You may be able to upgrade a PC running Windows XP to Windows Vista with SP1. Use the Windows Vista Upgrade Advisor to see if your PC can run Windows Vista. You can get Windows Vista with SP1 from a retailer or from Windows Marketplace.
Get Windows Vista Upgrade Advisor
Windows Vista with SP1 on new PCs
Shop for new PCsFree help updating with SP1
Windows Vista SP1 installation support


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