If you use Window XP, it may well just be the time for you to upgrade (or at least commence preparing to upgrade) as Microsoft has announced plans to pull the plug on Windows XP support in 2014. Whilst that might be a couple of years away, it by no means hurts to start off assessing your options so the eventual move to newer Microsoft OS will be as smooth and efficient as achievable.
Where you can find far far more particulars about Microsoft