Arya Dega's video: Lenovo B475 - How To Replace the Keyboard because of error on character continued self pressing

My Lenovo B475 keyboard got error. It pressing it self the "8" button number. It can stop if I punch the key. It's very uncomfortable because it can be happened when I'm doing my work, typing, on any software. Once a time, I search the Google for this conclusion. Most of the search result is suggesting to install some 3rd party antivirus. They said it's because of some trojan or worm virus. But after I installed the 3rd party antivirus... then my Laptop become infected with a new virus (detected by my BitDeffender). So guys, don't trust any one or any website that suggesting you to install some unknown antivirus. The problem is on the keyboard hardware it self. After I changed the keyboard, everything back to charm. And I never got this "auto push key" anymore.