Here are some links for “hardening” XP and minimizing your risk, until you can replace your computer.
http://www.microsoft.com/en-us/download/details.aspx?id=41138
http://www.thewindowsclub.com/secure-windows-xp-after-end-of-support-april-2014
http://windowssecrets.com/top-story/securing-xp-pcs-after-microsoft-drops-support/
http://www.foxguardsolutions.com/resources/details/xp-mitigation-techniques
Thanky...