i tend toward MSE these days as an antivirus cos im fat n dumb
and uMatrix cos im Paranoid (browser attacks and outdated plugins and XSS are the New Threat) altho uMatrix is a bit overkill and will kill most sites so maybe dont do that and use Ghostery and uBlock Origin.
p much second what everyones said in this topic w/ running malwarebytes and CCleaner (also run Spybot Search n Destroy to catch what malwarebytes doesn't) and also make sure you're Updated windows-wise cos otherwise ur computer could have an unpatched backdoor and could be part of a botnet/bitcoin mining rig. which if ur fan is fwooshing up a lot for no reason may be likely.
if ur paranoid about Telemetry make sure you dont install/uninstall the updates listed
here tho cos windows tried the Weird Spying stuff in retrograde "essential security" updates for win 7/8 too
also make sure ur laptop hardware is Updated n all cos i got a massive speed increase when i updated my graphics card drivers lmao
i remember my win7 laptop (cheap toshiba plastic piece of crap) used to freak out all the time cos of all the toshiba bloatware and the fact that it was not actually that good. and running ubanto lunix was the only thing that shut it up. then again running ubuntu was even worse, so
(edited cos i rambled too much about my dumb laptop dying)