Official support for Windows XP ended 8th of April 2014. There will be no more security updates or technical support for the Windows XP operating system. The problem is, of course, that once patches stop being provided for newly-discovered vulnerabilities, any problems that are found for more recent versions may well be backwards-compatible with XP. The world of Windows XP is a perpetual zero-day, with no hope of relief from danger.
I mean seriously, Windows 10 (or even Windows 7) has very low system requirements :
CPU : 1 GHz or faster (if your CPU doesn't support 64-bit OS then Windows 7 is your only real hope)
RAM : 1GB (32-bit) 2GB (64-bit)
Disk Space : 20GB give or take
These are not super high requirements by ANY stretch of the imagination. Hell, the only time I'll ever allow a Windows XP machine anywhere near anything is if it's NOT connected to the internet and no USB mass storage devices or CDs/DVDs can be used on the system. It's not safe it's not sustainable to run by any stretch of the imagination.