I never use this computer...
Good! Smash the HDD with a hammer (seriously) then drop it off at your nearest electronics recycling center.
IMPORTANT! => The WinXP computer should NOT be connected to the internet or any other computers. All of your personal data (e.g., online banking & credit-card passwords) should be considered at-risk, if not already compromised.
FYI...
• Support [and updates] for Windows XP ended on 08 April 2014
[http://windows.microsoft.com/en-us/windows/end-support-help](http://windows.microsoft.com/en-us/windows/end-support-help)
• Microsoft security research paints bleak picture for WinXP users after 08 April 2014
[http://www.zdnet.com/microsoft-security-research-paints-bleak-picture-for-xp-users-7000022537/](http://www.zdnet.com/microsoft-security-research-paints-bleak-picture-for-xp-users-7000022537/)
• Cyber threats to WinXP: Guidance for Home Users & Small Businesses
[http://blogs.technet.com/b/security/archive/2014/03/24/cyber-threats-to-windows-xp-and-guidance-for-small-businesses-and-individual-consumers.aspx](http://blogs.technet.com/b/security/archive/2014/03/24/cyber-threats-to-windows-xp-and-guidance-for-small-businesses-and-individual-consumers.aspx)