Microsoft offers support for 5 years after the release date for older versions of its software generally. Additionally five years is extended in case of a support. In case of windows 2000 (servers and workstations) and windows XP SP2, this period will soon be reached. Support for windows vista was also arrested last april 13. Just install SP2, to get assistance.
Online support knowledge base, Tools for debugging or frequently asked questions will be available for an additional year but paid attendance acc to microsoft. Security updates and telephone support will no longer be carried out from july 13. In case of xp sp2, it is easy to install sp3, and others have choosen to migrate to windows 7.