You can do the following
Hardware
- Replace HDD with SSD
- Add more RAM
Software
- Clean install of Windows 10 latest.
- Or Shift to Linux Ubuntu, Pop, or Mint
I gave an old PC a second life by installing a Linux distro (Ubuntu) on it. Using it as my download / Plex hosting machine. It’s safe no need to worry about malware and very good at resource management, considering how well it’s running on an old PC. I never switch it off, although Eskom did it for a us last week after a 26 hours power outage and our inverter’s battery died.
OP could also consider a Linux distro? Depending on their use case.
I'd just like to interject for a moment. What you're referring to as
Linux, is in fact, GNU/
Linux, or as I've recently taken to calling it, GNU plus
Linux.
Linux is not an operating system unto itself, but rather another free component of a fully functioning GNU system made useful by the GNU corelibs, shell utilities and vital system components comprising a full OS as defined by POSIX.
Many computer users run a modified version of the GNU system every day, without realizing it. Through a peculiar turn of events, the version of GNU which is widely used today is often called
Linux, and many of its users are not aware that it is basically the GNU system, developed by the GNU Project.
There really is a
Linux, and these people are using it, but it is just a part of the system they use.
Linux is the kernel: the program in the system that allocates the machine's resources to the other programs that you run. The kernel is an essential part of an operating system, but useless by itself; it can only function in the context of a complete operating system.
Linux is normally used in combination with the GNU operating system: the whole system is basically GNU with
Linux added, or GNU/
Linux. All the so-called
Linux distributions are really distributions of GNU/
Linux!