{{ambox|text=If you use Windows XP, you will need to have either Service Pack 3 or Hotfix KB918365 installed before installing the A-Star drivers. Some users who installed the hotfix have reported problems that were solved by upgrading to Service Pack 3, so we recommend Service Pack 3 over the hotfix.}}
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Before you connect your Pololu A-Star 32U4 (or another of our 32U4 family of boards) to a computer running Microsoft Windows, you should install its drivers:
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# Download the [https://www.pololu.com/file/0J1240/a-star-windows-1.3.0.0.zip A-Star Windows Drivers] (7k zip) and extract the ZIP file to a temporary folder on your computer. (These files are also available in the “drivers” directory from the [https://github.com/pololu/a-star A-Star repository on GitHub].)
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# Open the “a-star-windows” folder. Right-click on “a-star.inf” and select “Install”.
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[[Fichier:Pololu-Romi-32U4-Assembler-00.png]]
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# Windows will ask you whether you want to install the drivers. Click “Install” (Windows 10, 8, 7, and Vista) or “Continue Anyway” (Windows XP).