These are the recordings from my PC when I run speedfan:

GPU 53C
TEMP1 62C
TEMP2 41C
TEMP3 -128C
HD0 35C
CORE 58C
CORE 53C
AMBIENT 0C

At first I thought the problem of my PC shutting down when I am on gaming sites was that I needed a new PSU. Now having seen these recordings do I need a new fan fitted?

Thanks in advance for any advice offered ;O)

Speedfan can only be as accurate as your motherboard lets it. That 128C reading is false. If it was correct, your systems CPU would be just a heap of molten metal. What is your computer? What are its specs? You will need to look elsewhere for your problems. Places like memory troubles or hard drive corruption