What happened to my gaming laptop?

Before this i could run 2 minecraft clients at the same time on a server and my laptop would still run smoothly, but now i can't even open both of them cus my laptop would freeze for 5 seconds every once in a short while and i don't know what happened but now i can't even run sims 4 cus it also freezes every once in a while and trust me there was no other heavy background apps running

my laptop is a core i7 the last time i ran a scan on anti virus it detected 4 softwares slowing down my computer but i needed to upgrade the antivirus which means i'll have to pay extra in order to complete the check up so that's not helpful

What antivirus told you that? Grab a copy of malwarebytes and run a scan.

Try running malwarebytes to remove any walmare