Please don't! The problem is, when you connect a XP system to a network that has Internet access, you become
a threat to the rest of us! And that is not cool.
IF this issue put
only your computer,
only your security and
only your privacy at risk, then it would not be a problem. But it doesn't put only you at risk. Bad guys are actively seeking out XP systems to compromise and enlist in their bot armies
to attack the rest of us.
"
Because it still works" is no excuse.
These compromised systems are frequently used to distribute spam and malware, or as zombies in DDoS attacks on various institutions and organizations - without the XP user even being aware the system is compromised!
Do NOT think you are smarter than the bad guys! The right thing to do is to keep that system off the Internet.
That said, while retiring obsolete electronics before they die has been a fact of life since the invention of the vacuum tube, I totally understand the desire to keep such working legacy hardware productive. If the makers of your legacy hardware have refused to provide drivers for modern versions of Windows (and you cannot blame Microsoft for that!), I recommend you do one the following.
(1) Load this computer up with hard drives, block all its access to and from the Internet in your router, then turn it into a NAS (network attached storage). This is what I did with my old XP system that refused to die and it worked great as a backup server our other computers.
or,
(2) Format the drives and install one of the many free versions of Linux on it. Then you can connect to the Internet, allow the hardware to remain productive and out of the landfills. And most importantly, you will still be a responsible netizen.