You really do need to kill off that XP machine! It's going to be a prime target for malicious attackers. Either move to Windows 8.1 or get a Linux distro as they're dead easy to use these days. Try Ubuntu, or for older machines: Xubuntu.). You'll be more secure and supported for software updates.
The only downside as stated in the link below is there is no easy upgrade direct from XP to Windows 8.1. You need to backup all date and do a clean install. Then reinstall all your programs and drivers.