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Pcinacan in Best paid antivirus software.
You could download malware bytes since you could have a virus? you mentioned your pc is starting to get slow.
I don't even run anti virus, but if you're not confident in your surfing capabilities then i would get one.
Go buy Norton from you local walmart costs like 50$ for a year. There are free ones like AVG but it really depends on the protection you want.
Good hackers can make rats/etc that can get through most firewalls.
In summary;
Download malware bytes and see if that fixes your problem if not you could buy Norton or something.
Last case senario;
Take your pc to a store and have them clean it or you can do it with a fresh windows install and start fresh ( you'll lose all your documents )