I don't think older Nvidia cards had the sensors to monitor temps and fan speeds. You should manually check the fan for proper operation and clean the card with compressed air. If needed you can find a replacement fan here.
Newegg.com - Computer Hardware,Fans & Heatsinks,VGA Cooling,VGA Card Processor,
It sounds almost like a problem with the refresh rate. Here is the newest driver for your card (don't expect anymore as support has been discontinued, I think).
GeForce Release 175