Microsoft is warning us :

extrait : "There is a sense of urgency because after April 8, Windows XP Service Pack 3 (SP3) customers will no longer receive new security updates, non-security hotfixes, free or paid assisted support options or online technical content updates. (...)"

Translation : Microsoft, beginning in April 2014, will start messing with you by sponsoring malwares of all kinds, specifically targeting Windows XP, so you end up scared and eventually purchase a new computer (most of us running Windows XP cannot install a newer operating system on the same hardware given the much higher requirements of Windows 7, let alone Windows 8).

So basically, this is the Microsoft mafia, not hackers out there, getting ready to knock your door.