How do I completely uninstall a bad antivirus utility?

Jennifer from Moreno Valley, CA

Episode 939 (1:36:37)

ESET

Jennifer updated her subscription to Avast and now her computer is all screwed up and they want her to pay for a certified technician. So, she went to Eset and they helped her by giving her an uninstall tool. Now she can't install Nod32 because it can't connect to the Internet. Leo says that is likely something left over from Avast that is causing the issue. Check out Avast.com's Uninstall Utility. The chatroom also suggests booting up in safe mode before running the Avast uninstaller for better results.

(Disclaimer: ESET is a sponsor).