The only help I can offer is that I also got a S.M.A.R.T. warning shortly before my HDD died - fortunately it was not my Primary (system) disk.
You could download `HDD Health` click here which is freeware and see if that gives you any more help.
You can use any make of disk to replace the one you have. If it is a SATA disk it makes it easier because there are no jumpers. You will also need software to make a mirror image of your drive unless you are prepared to start from scratch.
You could also copy the registration file (WINDOWS/System 32/wpa.dbl) onto a floppy if you are starting from scratch. It may negate the need to re-register.