First of all any drive that old is ready for retirement. The heads are probably worn. Just that alone will cause a never ending list of problems.
A good article on how to go about reading various temps on old systems is seen at Software for monitoring temperatures
You'll note the mention of the System Info for Windows tool free at SIW | System Information for Windows by Gabriel Topala
That will read hard drive, cpu, even video card temps farely accurately. SpeedFan is a bit of work and often provides false temps.
Quote: "Anyone know the labels on the nVidia nforce mobo?" Are you referring to specifications there or max temps? The make and model system or board would help for that.