Start by checking to see if your computer will handle either Win-7 or 8. 
Here's a test utility for upgrading to Win-7;
http://windows.microsoft.com/en-us/windows/downloads/upgrade-advisor

Here's a test utility for upgrading to Win-8;
http://windows.microsoft.com/en-us/windows-8/upgrade-from-windows-vista-xp-tutorial

If both tests fail, you've got two options, a new computer or replace 
your Microsoft XP with free Vinux;
http://vinuxproject.org/


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