yasir siddiqui :
Sir, please tell me the avg and safe temperature of i3 2100 processor?
Average depends on your surrounding air temperature. If your room temperature is really high (30C, or 86F or higher), then the processor will get much hotter than if the room was cool (say 20C or 68F) The max safe temperature specified by Intel is 70C. I did find one thread saying that at 25C room temperature with a stock cooler and aftermarket thermal paste that he had 54C at load. However, I don't know how he tested load (prime 95, or just playing a video game).
If you are seeing unsafe temperatures with the stock cooler, then it may have been put on improperly. Make sure the heatsink mounting pins are all the way through the motherboard and that the heatsink is firmly attached. If it doesn't seem to be attached correctly you may want to remove it, apply new thermal paste after cleaning it off, and then remount the heatsink.
EDIT: seems to be conflicting information on what the max temperature of the i3-2100 is. On Intel's page it says TCase = 69.1C. I've seen another measurement TJMax = 100, but can't find that on Intel's website.