I do not intend to ever let my windows 7 computer die!
Sounds like this computer is very important. A client of mine has software made around Windows 95 that he cant do without that doesn't play well with Windows 7 or 10, but it plays well with XP.
When his computer died he had 3 options.
- Buy newer software that would work with Windows 10
- Buy a same make/model computer and migrate the healthy hard drive over to that system
- Run a Windows XP Virtual Machine environment on a refurb or new Windows 7 build.
He chose to run the software in a virtual machine environment on a newer Windows 7 laptop that supported running a Windows XP virtual machine. And I worked the magic to migrate that build to a virtual machine for him to be able to use it for his office.
Because he uses this system offline from the internet he could run it without worry of vulnerabilities which are mostly vulnerabilities that require an internet connection to get infected or compromised.
If the computer is not connected to the internet then drastically less worries with lack of security updates, because 99.9% of any future vulnerabilities will be ones that were engineered to exploit a system that is online.
You might want to have a system handy that is ready to be used in the event that the main older system dies on you. Also regular backups of data so that in the event that a hard drive dies you can restore the latest backup to that spare system and be back up and running if its critical that you have this system available to you for your work.