Question : free upgrade to windows xp service pack 2

I am getting the following message when I try to install quick cam.

"This product requires windows xp Service Pack 2 or later. Please upgrade your operating system before launching th setup again"

Please let me know where can I find such an upgrade for FREE online on any website.

Thank you in advance.

Answer : free upgrade to windows xp service pack 2

Run windows update. In IE click on tools and then select Windows Update. This will install a whole lot of patches including service pack 2 - All free