So are you saying the PC has died but the hard drive is OK? Or is it just not booting/working?
If you do need a new PC, you can buy any and install the old drive as a 2nd drive in it. You will be able to see all your files in new locations such as F: or G: or whatever (new PC would probably be using C:, D:, E:)
Or if you buy a laptop, you put the old drive in an external USB caddy and can see it there.