Please, lets not turn this into a flame war or your thread will be locked. Amiga Os3.9, running on hardware from the 1990's, compete with modern OS? Depends. What do YOU want the OS to do? If your finding the OS cannot meet your demands, then use Windows XP. Or infact, try Windows95, that was written closer to the Amiga OS3.9 date, and lets see what happens. Most people use the amiga as a hobbyist machine, and a lot also have a modern day PC as a day-to-day computer. Remember how old the hardware/software is that your using. You can always wait for Amiga OS4.0 if you do want a more modern day amiga. A lot of amiga users are

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And to clarify,
look. I installed the MUI thing. It did all alone so what am I supposed to do?
You are asking questions.