You might try loading a 
version of Linux (I use 
Mint now) on that old machine.  I have a VERY old HP laptop that would barely run on Windows so I wiped the hard drive and installed the  
Ubuntu version of Linux.  Now that machine hums along very smoothly and I am able to do everything on it that I used to do with Windows.  You can download the version you want on a thumb drive and then run it from that if you choose or you can load it into your computers drive.  The install program gives you the choice.
Barney