I have posted this in other forums, too, in the hopes of getting some ideas.
I recently installed Windows 10 on a desktop computer and everything went as smoothly as it could have, with no problems at all. So, motivated by how well everything went with that computer, I decided to upgrade Windows on a laptop as well. The laptop is a Toshiba Satellite L855, with an Intel Core i3-2370M processor.
The upgrade process on the laptop also completed successfully. Now both computers have Windows 10 and so far it has been running... fine.
The only unusual thing I've noticed with the laptop is that the CPU fan wants to run at full speed all the time, even though the computer is never used for any "processor-intensive" tasks. The normal activity on it is browsing the web, watching videos, playing music, writing text files and really nothing more than that.
I immediately found this odd and I have come to the conclusion that something in Windows 10 is responsible because:
a) This never happened in Windows 7, which was the previous operating system the computer had, and
b) This doesn't happen when I start the computer and go into a different operating system, namely Ubuntu.
Well, thank you everybody for reading and please give some advice if you have any. Surely I'm not the only one who has run into this situation.