What does Windows Ultimate Booster program stand for? If you’ve found this program running on your PC it is surely necessary to know more about it. How in the world did this application appear on your PC if you’ve never installed it in the first place? This is a good question, for sure. Windows Ultimate Booster is a rogue antivirus, fake anti-spyware which must be immediately deleted from your system. This guide will help you remove it completely from your system.