Reapply thermal paste will do, but not much.
ALWAYS Right click toolbar, and run task manager and check what application or viruses are locking your cpus process and causes overheating. normally usage CPU usage will not throttle above 10% usage. GPU will normally be 49 +- *C when regular use.
REMEMBER THIS IS ALWAYS CAUSE BY SOFTWARE, AND USER ATTITUDE. What type of antivirus u use also matter.
CPU, GPU re-paste only have to be done after years of using your notebook. If you always cheated by online adware or you hit viruses. boom! Daily 89% of my customers PC have nothing wrong with their PC's hardware. If i'm a bad guy, i can charge RM80 or more for services, and start lying about reformat or cleaning bullshits. BUT Truth spoken, RM10 service charge, and i'm always poor.
Be aware when you approaches IT services providers out there. If you can, try to learn yourself. No one will tell the truth, no one will let go a fish.
you are the one who let the fish go...