Well, the obvious is you need to upgrade to a modern and
secure operating system that is still receiving security updates. And if your legacy hardware will not support a modern version of Windows, then you can try Linux, or accept you need to bite the bullet and upgrade your hardware.
While we all hate to retire hardware that still works, it is just a fact of life. We have all done it with still working CRT televisions and monitors, cassette players, cell phones, hard drives and more. The difference here is that it is important to remember the problem with Vista (and XP) is not just that they might become a security threat to the user. The problem is they may become compromised then used by the bad guys to distribute malware or spam, or as zombies in DDoS attacks. That is, they may be used as threats against the rest of us - without the user even being aware their Vista system is compromised. So at the very least, these systems should not be connected to a network that has Internet access.
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The driver problem is because Vista is so old all support for it ended over 2 years ago. I did find
generic Intel drivers for Vista you could try. I also found
this but I really couldn't tell you is it works or not.
Sorry I could not be of more help. Good luck.