Help keep your PC trouble-free with Windows Live OneCare Beta Get always-on security and performance for your computer--antivirus, anti-phishing, and antispyware protection, a two-way firewall, backup and restore, and regular tune-ups--all in one convenient package. Download your 90-day free trial today

Activate a product key Do you have a product key? You can activate it here.

Add another PC Already a subscriber? Learn how to add another computer here.

Activate Online Backup for photos Keep your memories safe. Add online backup for photos to your OneCare subscription. Add 50 gigabytes of online backup for photos.

* Final price will be confirmed at the point of purchase based on your country location/currency and may differ from the price that appears here.

Read the Windows Live OneCare system requirements.

Before installing OneCare, make sure to uninstall any other antivirus or firewall programs currently on your computer. Learn more.