Update your post to include full system hardware specs and OS information.
Include PSU: make, model, wattage, age, condition?
Disk drives: make, model, capacity, how full?
Problems can go beyond just temperatures.
Use Task Manager, Resource Monitor, and Process Explorer to observe system performance that leads to overheating.
Use all three tools but only one at a time.
Task Manager and Resource Monitor are part of Windows.
You will probably need to install Process Explorer (free, Microsoft) via Microsoft's website.
https://docs.microsoft.com/en-us/sysinternals/downloads/process-explorer
Learn what resources are being used, to what extent (%), and what is using any given resource especially when the temperatures increase.
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Power down, unplug, open the case.
Clean out dust and debris. Ensure that air flows are not obstructed.
Ensure by sight and feel that all connections, cards, RAM, and jumpers are fully and firmly in place.