Mysql challenge

Hellow @Mosh I downloaded mysql following every step in one of your youtube guides, ‘MYSQL FOR BEGINNERS’ yet, for the windows guide, I could not still install it. It’s telling me, failed to connect to server and because I had tried installing this and it failed continually, I had to create a new user window to see whether the installation will work this time only to be surprised that everything was almost successful but in the end it displayed ‘ONLY ONE INSTANCE OF MYSQL INSTALLER FOR WINDOWS CAN BE RUN AT A TIME’. What should I do please?