|After cold start, open Task Manager and check your CPU usage on the performance tab. If the usage is 100% then you may have malware running in the background and causing abnormally high heating. There may be another reason it is getting quite so hot, but suddenly very high CPU usage can make it run much warmer than is normal for the system. Normally high CPU usage will only make it run hotter than normal but still within acceptable range, but if there is a lack of proper air flow inside of the case (blocked vents front or back, weak or non working rear exhaust fan, etc.) or other issues, both together could cause your sudden problem.|
Some computer cases have a foam filter over the intake front vent but it may be behind the plastic front bezel and may not be visible so you will have to look hard to see if it is blocked and you may need to remove the front to access it to clean it.
You should run Malwarebytes to check for an infection and remove it.
You can run msconfig, go to the Start tab and uncheck all except Microsoft and your antivirus program (come can be added back later if needed), Apply, and restart the machine.
You have to be a little bit crazy to keep you from going insane.