For details see:
where they mention that this puts your PC at risk and offers two options to fix that:
I think they missed at least one:How do I stay protected?
To stay protected now that support has ended, you have two options:
Upgrade your current PC
Get a new PC
Use Opera, Chrome and/or Firefox as your browser(s) and get an anti-virus/anti-malware program not written by MS (like Malwarebytes and/or AVG), which if you're an XP user, are two things you should have done a long time ago.
Oh, but that wouldn't require you to pay MS and/or their licensors any money, so of course that's not mentioned.