I just got a SSD yesterday for my decade old core2duo PC and it has totally helped. The system has been chugging along, but web browsing and opening different stuff was getting really sluggish, so now a new drive with a fresh windows install seems to do the trick. I could totally update the PC to a pretty good AMD ryzen setup for under $300 (just need the MB, processor and RAM, all my other stuff would still work) but my setup still works for most stuff I do.