My Dell tower has been running Windows Vista since it was new 5 years ago. But as I run more and more software simultaneously, it got to the point where it would freeze-up in the middle of my work and need to be rebooted. This was especially bothersome when I was helping someone on the telephone. I reached the point where I had to upgrade it or replace it. Friday night my brother Lloyd doubled the RAM and added a second hard disk. And it seems to have solved the problem!