Why is my antivirus program slowing down my computer so much?

Episode 996 (1:01:37)

Bill from Ohio
ESET

Bill convinced his girlfriend to use Eset Nod 32 on her five year old computer, but now it's starting to freeze up. So they decided to buy a new computer and now it's also having trouble on the new machine. Once they uninstalled it, the machine is working again!

Leo says that if the computer came with McAfee installed, even if he uninstalled it, there may be some bits left that's causing the issue. They have a removal tool which can clean it up. He should also be sure that Microsoft Defender is turned off.

(Disclaimer: ESET is a sponsor)