As you're probably aware by now there has been a large scale attack on computers running XP with the WannaCrypt worm.
Over 200,000 systems have been reported as infected.
If you are still running XP its recommended that you patch your copy
https://blogs.technet.microsoft.com/msrc/2017/05/12/customer-guidance-for-wannacrypt-attacks/I'd go one step further and say it really is time you
UPGRADED your computer. Even a cheap second hand one running Windows 7 would be good enough.
XP isn't supported as an OS according to the features page
Supported operating systems: Windows 7, Windows 8, Windows 10. Other versions might work but are unsupported;
We cannot guarantee to be able to help you if you've fallen victim to this ransomware.