I took a look at the video of the virus you are referring to. This computer virus seems like some malware. You should download Rkill onto your computer or transfer it from a USB drive and run it to stop the virus/malware from flickering the screen. Next run an installed antivirus program to do a full scan of the hard drive and have it remove any found viruses. If the flickering is still present once the computer is rebooted, an anti-malware program may have to be ran on the system. You may need to download a free version of one if you do not have any anti-malware software on your computer. Malwarebytes is a good ant-malware program. It resolves most malware issues when a full scan is ran.