Please be aware that Microsoft will terminate support of Windows XP/SP3 on April 8, 2014
That means it will no longer have updates and patches to prevent PC infections.
Once support is withdrawn by Microsoft, it will be impossible to secure the XP machine. It won't matter how many firewalls, anti-virus scanners, or other security programs are installed.
Any XP machine that is online after that date will get infected repeatedly, and any useful information on it will likely be stolen. It will NOT be fixable.
Some may want options for the upcoming support deadline.
Win XP users who want to save their machines: Windows XP - The Elephant in The Room
Methods of Rescuing computers currently using Windows XP, so they can be safely used online, after Windows XP is no longer a safe Operating System to use.