Thanks for your response. I have considered that. I actually have a couple of those fans lying around, but they are quite noisy. I might think of looking into a new one, but it is an old case, so I might as well upgrade the case.
I have cleaned the fan with a can of compressed air already, it was a bit dusty, but it did not seem to make a difference.
Sorry. The above should be 60 degrees temp for windows updates not 70 degrees.
Should I try arctic silver thermal paste?
I was thinking that its the thermal paste thats the issue. The old tube might have gone bad. Any ideas?