Do not waste time clicking "OK." That is what the script wants.
The original code is believed to have been created by an anonymous 4chan user or a member of the early "hacktivist" prankster community around 2003-2005. It spread via AIM (AOL Instant Messenger), MySpace comments, and shady "free ringtone" websites. The programmer simply wanted to prove a point: users will click anything. You Are An Idiot Fake Virus
Unlike a blue screen of death (which feels neutral), being called an "idiot" by your computer is a personal insult. Victims often didn't ask for help because they were embarrassed—exactly the reaction the prankster wanted. Do not waste time clicking "OK